Shop power transformer

Sponsored
About our ads
$1,027.42
Hammond Power Solutions C1F007LES - Transformer 7.5Kva 240X480v-120/240V
Essential Electric Supply
25% off
$1,027.42
Hammond Power Solutions C1F007LES - Transformer 7.5Kva 240X480v-120/240V
Essential Electric Supply
$1,805.47
$2,457.00
Hammond Power Solutions SG3A0015KB - 3-Phase Transformer 15Kva 480D-208Y/120V
Essential Electric Supply
26% off
$1,805.47
$2,457.00
Hammond Power Solutions SG3A0015KB - 3-Phase Transformer 15Kva 480D-208Y/120V
Essential Electric Supply
$2,533.64
Hammond Power Solutions SG3A0015KB0C - 3-Phase Transformer 15Kva 480D-208Y/120V
Essential Electric Supply
26% off
$2,533.64
Hammond Power Solutions SG3A0015KB0C - 3-Phase Transformer 15Kva 480D-208Y/120V
Essential Electric Supply
$2,639.25
3-Phase Autotransformer 600-480-400-240-208V
Maddox
$2,639.25
3-Phase Autotransformer 600-480-400-240-208V
Maddox
$1,945.00
1-Phase 240X480 - 120/240 25 Kva Transformer
Maddox
$1,945.00
1-Phase 240X480 - 120/240 25 Kva Transformer
Maddox
$924.84
Middleby 31504 Transformer - 240/480V Primary 120V Secondary - 200Va - Transformers
Parts Town
$924.84
Middleby 31504 Transformer - 240/480V Primary 120V Secondary - 200Va - Transformers
Parts Town
$359.55
Aaon P50591 Transformer - 240-480 To 120-240V - 1.5Kva - Transformers
Parts Town
Free shipping
$359.55
Aaon P50591 Transformer - 240-480 To 120-240V - 1.5Kva - Transformers
Parts Town
$2,736.00
T3030K0013B HUBBELL - Transformers & Dry Transformer Supplies
Radwell.com
$2,736.00
T3030K0013B HUBBELL - Transformers & Dry Transformer Supplies
Radwell.com
$2,453.13
3-Phase 480V Delta - 208 Y 120 45 Kva Transformer | New
Maddox
$2,453.13
3-Phase 480V Delta - 208 Y 120 45 Kva Transformer | New
Maddox
$585.75
9T51B0145 GENERAL ELECTRIC - Transformers & Dry Transformer Supplies
Radwell.com
$585.75
9T51B0145 GENERAL ELECTRIC - Transformers & Dry Transformer Supplies
Radwell.com
$50.04
Functional Devices | TR100VA001 | Transformer 100Va, 120 To 24 Vac, Circuit Breaker, Foot And Single Threaded Hub Mount
Kele
$50.04
Functional Devices | TR100VA001 | Transformer 100Va, 120 To 24 Vac, Circuit Breaker, Foot And Single Threaded Hub Mount
Kele
$128.25
B100LP7JK MICRON INDUSTRIES CORPORATION - Transformers & Control Transformer Supplies
Radwell.com
$128.25
B100LP7JK MICRON INDUSTRIES CORPORATION - Transformers & Control Transformer Supplies
Radwell.com
$33.67
Honeywell - AT140A1018 - 40 VA General Purpose Transformers Power 24 Vac Circuits | Skip The Warehouse
Skip The Warehouse
$33.67
Honeywell - AT140A1018 - 40 VA General Purpose Transformers Power 24 Vac Circuits | Skip The Warehouse
Skip The Warehouse
$68.50
Arzel TRANS40VARS 40 Amp Transformer | Skip The Warehouse
Skip The Warehouse
$68.50
Arzel TRANS40VARS 40 Amp Transformer | Skip The Warehouse
Skip The Warehouse
$290.00
Siemens 4AM6142-8DD40-0FA0 SITAS Transformer, 1-Phase
PLCHardware.com
$290.00
Siemens 4AM6142-8DD40-0FA0 SITAS Transformer, 1-Phase
PLCHardware.com
$792.24
Hobart 00-294500-00053 OEM Transformer,500Va,50/60 Hz
WebstaurantStore
$792.24
Hobart 00-294500-00053 OEM Transformer,500Va,50/60 Hz
WebstaurantStore
$146.32
9070T50D1 Square D Control Transformer
Standard Electric Supply Co.
1
$146.32
9070T50D1 Square D Control Transformer
Standard Electric Supply Co.
$113.03
$216.00
MT0100A Siemens Control Transformer
Standard Electric Supply Co.
2
47% off
$113.03
$216.00
MT0100A Siemens Control Transformer
Standard Electric Supply Co.
$208.42
9070T150D1 Square D Control Transformer
Standard Electric Supply Co.
3
$208.42
9070T150D1 Square D Control Transformer
Standard Electric Supply Co.
$44.49
Goodman 0130M00140S Transformer - 120V To 24V - 40Va - 60Hz - Transformers
Parts Town
3
$44.49
Goodman 0130M00140S Transformer - 120V To 24V - 40Va - 60Hz - Transformers
Parts Town
$900.00
15 Kva 3 Phase 480V-240V Delta Dry Type Transformer
BuyMyBreaker.com
$900.00
15 Kva 3 Phase 480V-240V Delta Dry Type Transformer
BuyMyBreaker.com
$444.15
Rational 40.06.004P OEM Power Transformer
WebstaurantStore
$444.15
Rational 40.06.004P OEM Power Transformer
WebstaurantStore
$118.99
TS200 200W AC Low Voltage Transformer With Digital Timer
Kings Outdoor Lighting
$118.99
TS200 200W AC Low Voltage Transformer With Digital Timer
Kings Outdoor Lighting
$1,416.50
Square D Dry Type Power Distribution Transformer: 240V AC/480V AC, 120V AC/240V AC, Wall, Aluminum Model: 2S1F
Grainger
1
$1,416.50
Square D Dry Type Power Distribution Transformer: 240V AC/480V AC, 120V AC/240V AC, Wall, Aluminum Model: 2S1F
Grainger
$95.29
ETI CT Voltage Transformer 380/400V 100VA | 11253
Tameson.com
$95.29
ETI CT Voltage Transformer 380/400V 100VA | 11253
Tameson.com
$16.32
Triad Magnetics TCT40-01E07AE-15 Chassis Mount Transformer, 40Va | Chassis Mount Transformers
Newark
$16.32
Triad Magnetics TCT40-01E07AE-15 Chassis Mount Transformer, 40Va | Chassis Mount Transformers
Newark
$27.99
OSD SP70T 70V Commercial Transformer
Crutchfield
$27.99
OSD SP70T 70V Commercial Transformer
Crutchfield
$109.90
VEVOR 5000Va Voltage Auto Converter Transformer, Heavy Duty Step Up/Down 110V To 220V & 220V To 110V, 3 Us & 3 Eu Outlets, Lcd Display, Circuit Breake
VEVOR
516
$109.90
VEVOR 5000Va Voltage Auto Converter Transformer, Heavy Duty Step Up/Down 110V To 220V & 220V To 110V, 3 Us & 3 Eu Outlets, Lcd Display, Circuit Breake
VEVOR
$826.19
Bakers Pride 2E-M1376A OEM Transformer, 240/480V,Kva>0.25
WebstaurantStore
$826.19
Bakers Pride 2E-M1376A OEM Transformer, 240/480V,Kva>0.25
WebstaurantStore
$321.00
$391.12
Contractor Series 600-Watt Stainless Steel Low Voltage Outdoor Landscape Light Transformer (1-Pack)
Home Depot
Free shipping
17% off
$321.00
$391.12
Contractor Series 600-Watt Stainless Steel Low Voltage Outdoor Landscape Light Transformer (1-Pack)
Home Depot
$21.86
Triad Magnetics TCT50-05E07AB Transformer, Class 2, 24V, 50Va | Chassis Mount Transformers
Newark
$21.86
Triad Magnetics TCT50-05E07AB Transformer, Class 2, 24V, 50Va | Chassis Mount Transformers
Newark
$28.95
Powerselect PS20B75A 20W To 75W Electronic Low Voltage Transformer
Ballast Shop
$28.95
Powerselect PS20B75A 20W To 75W Electronic Low Voltage Transformer
Ballast Shop
$945.44
Acme Electric Dry Type Power Distribution Transformer: 120V AC/208V AC/240V AC/277V AC, Wall, Copper Model: T279742S
Grainger
$945.44
Acme Electric Dry Type Power Distribution Transformer: 120V AC/208V AC/240V AC/277V AC, Wall, Copper Model: T279742S
Grainger
$158.48
DAYTON Control Transformer: 208V AC/277V AC, 120V AC, Foot, 150 VA, Primary And Secondary Fuse Model: 31EH29
Grainger
$158.48
DAYTON Control Transformer: 208V AC/277V AC, 120V AC, Foot, 150 VA, Primary And Secondary Fuse Model: 31EH29
Grainger
$19.55
Triad Magnetics VPT230-110 Transformer, Toroidal, 2 X 115V, 25Va | Toroidal Power Transformers
Newark
$19.55
Triad Magnetics VPT230-110 Transformer, Toroidal, 2 X 115V, 25Va | Toroidal Power Transformers
Newark
$166.99
TSP300 300 Watt Low Voltage Transformer With Digital Timer
Kings Outdoor Lighting
1
$166.99
TSP300 300 Watt Low Voltage Transformer With Digital Timer
Kings Outdoor Lighting
How Does a Power Transformer Work? âš¡ Simple Explanation for Beginners
1:13
How Does a Power Transformer Work? âš¡ Simple Explanation for Beginners
43.7K views4 months ago
YouTubeBrightPath Electrical Engineering Training
How a Power Transformer Actually Works!
1:17
How a Power Transformer Actually Works!
162 views4 months ago
YouTubeMindScope_En
What is Transformer - Working Principle - 3D Animation
5:09
What is Transformer - Working Principle - 3D Animation
6.9K viewsFeb 24, 2024
YouTubeIT and Automation Academy
How Power Transformers work ? | Epic 3D Animation #transformers
21:06
How Power Transformers work ? | Epic 3D Animation #transformers
1.3M viewsJul 20, 2024
YouTubeThe science works
How a Power Transformer Works | Animated Breakdown
10:29
How a Power Transformer Works | Animated Breakdown
3.4K viewsMar 23, 2025
YouTubeGGHH Animations
Power Transformer: The Complete Guide
11:07
Power Transformer: The Complete Guide
34 views7 months ago
YouTubeIQS Directory
How does a Transformer work - Working Principle electrical engineering
6:30
How does a Transformer work - Working Principle electrical engineering
2.9M viewsApr 9, 2018
YouTubeThe Engineering Mindset
13:42
Power Transformer - 3D Animation
1.4M viewsOct 7, 2023
YouTubeLifeAda
1:31
Working Principle of Power Transformers | Explained Simply
946 viewsMay 8, 2024
YouTubePolonium Technologies
4:23
How Do Electrical Transformers Work? | Step Up & Step Down Transformer Explained
3.6K viewsSep 16, 2023
YouTubeElectrology
5:48
How does a Transformer work ?
9.6M viewsJul 31, 2014
YouTubeSabin Civil Engineering
1:45
Power Transformers — Overview
215 views5 months ago
YouTubeGajanan Ramchandra Meshram
13:25
Transformer Working | Transformer Working Explanation
660.1K viewsMay 3, 2023
YouTubeDeepakkumar Yadav
7:19
How Does a Transformer Work? | Electrical Engineering Explained
6K viewsNov 30, 2024
YouTubeDammyTech Electronics
19:13
Transformer Working Principle | Complete Beginner's Guide | TheElectricalGuy
6.6K views10 months ago
YouTubeGaurav J - TheElectricalGuy
3:15
Understanding the Different Parts of Power Transformer
2.3K viewsJun 18, 2024
YouTubeTech Knowlogy
2:56
Power Transformer Characteristics
329 views8 months ago
YouTubePower System Operation Slides
MSN
8 months ago
MSN
24:24
How 3 Phase Transformers Work – why we need them
2M viewsJun 11, 2024
YouTubeThe Engineering Mindset
18:44
How to Install a Transformer - Let's Break Into It!
96.2K viewsSep 9, 2024
YouTubeElectrician U
2:44
How Electrical Power Transformers Are Made in a Factory
285 views9 months ago
YouTubeDiscover Hub
11:06
Everything You Need to Know About Transformers | Step-Up, Step-Down & How They Work #transformers
23.5K views5 months ago
YouTubeEngineeringness
19:51
125 MVA Power Transformer Unloading Process | Step by Step Explanation | Electrical engineering
2.1K viewsMar 3, 2025
YouTubeKrushna
12:13
Step-Up vs Step-Down Transformers | Key Differences and Uses Explained
7.8K viewsJul 25, 2024
YouTubeHistory of Simple Things
16:33
Transformers Explained - How transformers work
3.5M viewsMay 14, 2022
YouTubeThe Engineering Mindset
6:59
Transformer Parts and Functions
561.6K viewsNov 4, 2018
YouTubesaVRee
2:49
Different Types of transformers | Types of transformers
47.1K viewsJul 5, 2023
YouTubeLearning Engineering
8:37
How does a Transformer work ? | working principle of transformer | Transformer working animation HD
175.3K viewsAug 1, 2020
YouTubePhysics and animation
4:47
How a Transformer Works 3D
40.4K viewsDec 4, 2022
YouTubeHVAC School
8:59
Understanding the Parts of a Transformer | Electrical Engineering Basics
611 viewsMar 2, 2025
YouTubeChandan Bobby
See more
You may also want to search

Short videos

1:13
How Does a Power Transformer Work? âš¡ Simple Explanation for Beginners
43.7K views4 months ago
YouTubeBrightPath Electrical
1:17
How a Power Transformer Actually Works!
162 views4 months ago
YouTubeMindScope_En
1:31
Working Principle of Power Transformers | Explained Simply
946 viewsMay 8, 2024
YouTubePolonium Technologies
1:31
How Power Transformer Work?Working of Power Transformer Fully Explained
16 views4 months ago
YouTubeTech Invention
0:08
Understanding Industrial Power Transformers
5M viewsJul 7, 2023
TikToklstransformer_1975
0:33
How Power Transformers Actually Work || #electrical #ytshorts
1.3K views4 months ago
YouTubeLineman Universe
1:00
How does a power transformer work #knowledge #science
342.9K views6 months ago
YouTubeExplore scientists
0:35
How a High Voltage Power Transformer Works ⚡ | Stepping Power Up & Down 🔥
30.3K views2 months ago
YouTubeSnap Study
0:26
Unlocking the Secrets of Power Transformers & 3-Phase Motors…
702 views9 months ago
YouTubeINDUSTRIAL TECH
0:11
🔥 Inside a Power Transformer 🧲⚡#Transformer #HowItWorks #ElectricalEngineering
377 views3 months ago
YouTubeShoheb Mohammed
1:00
How does a power transformer work?#science #usa #knowledge
1.2K views4 months ago
YouTubeScience001
1:45
Power Transformers — Overview
215 views5 months ago
YouTubeGajanan Ramchandra Meshra
2:56
Power Transformer Characteristics
329 views8 months ago
YouTubePower System Operation Slide
0:26
Power Transformer Tutorial#trending
9 views3 months ago
YouTubeElectric Alamin
0:30
Transformer and Voltage Explained | Step Up & Step Down Transformer | Electrical
2K views4 months ago
YouTubeElectrofamily05
0:25
Inside a Power Transformer Winding Process âš¡
1.8K views1 month ago
YouTubeDaelim Belefic Transformer
0:36
Power Transformer Components Explained #powertransformer
3.6K views6 months ago
YouTubeAj Technology
0:23
Power Transformer
1.4K views6 months ago
YouTubeEE ENGINEERS • 83K views •
0:45
What is Step Up Transformer? | Working Principle, Construction & Uses
182 views3 months ago
YouTubeelectrical engineering#
0:24
The Secrets of Power Transformers: How Windings Make Electricity Work!
3.8K views5 months ago
YouTubeDaelim Belefic Transformer

Shop power transformer

Sponsored
About our ads
$128.25
B100LP7JK MICRON INDUSTRIES CORPORATION - Transformers & Control Transformer Supplies
Radwell.com
$128.25
B100LP7JK MICRON INDUSTRIES CORPORATION - Transformers & Control Transformer Supplies
Radwell.com
$33.67
Honeywell - AT140A1018 - 40 VA General Purpose Transformers Power 24 Vac Circuits | Skip The Warehouse
Skip The Warehouse
$33.67
Honeywell - AT140A1018 - 40 VA General Purpose Transformers Power 24 Vac Circuits | Skip The Warehouse
Skip The Warehouse
$68.50
Arzel TRANS40VARS 40 Amp Transformer | Skip The Warehouse
Skip The Warehouse
$68.50
Arzel TRANS40VARS 40 Amp Transformer | Skip The Warehouse
Skip The Warehouse
$290.00
Siemens 4AM6142-8DD40-0FA0 SITAS Transformer, 1-Phase
PLCHardware.com
$290.00
Siemens 4AM6142-8DD40-0FA0 SITAS Transformer, 1-Phase
PLCHardware.com
$792.24
Hobart 00-294500-00053 OEM Transformer,500Va,50/60 Hz
WebstaurantStore
$792.24
Hobart 00-294500-00053 OEM Transformer,500Va,50/60 Hz
WebstaurantStore
$146.32
9070T50D1 Square D Control Transformer
Standard Electric Supply Co.
1
$146.32
9070T50D1 Square D Control Transformer
Standard Electric Supply Co.
$113.03
$216.00
MT0100A Siemens Control Transformer
Standard Electric Supply Co.
2
47% off
$113.03
$216.00
MT0100A Siemens Control Transformer
Standard Electric Supply Co.
$208.42
9070T150D1 Square D Control Transformer
Standard Electric Supply Co.
3
$208.42
9070T150D1 Square D Control Transformer
Standard Electric Supply Co.
$44.49
Goodman 0130M00140S Transformer - 120V To 24V - 40Va - 60Hz - Transformers
Parts Town
3
$44.49
Goodman 0130M00140S Transformer - 120V To 24V - 40Va - 60Hz - Transformers
Parts Town
$900.00
15 Kva 3 Phase 480V-240V Delta Dry Type Transformer
BuyMyBreaker.com
$900.00
15 Kva 3 Phase 480V-240V Delta Dry Type Transformer
BuyMyBreaker.com
$444.15
Rational 40.06.004P OEM Power Transformer
WebstaurantStore
$444.15
Rational 40.06.004P OEM Power Transformer
WebstaurantStore
$118.99
TS200 200W AC Low Voltage Transformer With Digital Timer
Kings Outdoor Lighting
$118.99
TS200 200W AC Low Voltage Transformer With Digital Timer
Kings Outdoor Lighting
$1,416.50
Square D Dry Type Power Distribution Transformer: 240V AC/480V AC, 120V AC/240V AC, Wall, Aluminum Model: 2S1F
Grainger
1
$1,416.50
Square D Dry Type Power Distribution Transformer: 240V AC/480V AC, 120V AC/240V AC, Wall, Aluminum Model: 2S1F
Grainger
$95.29
ETI CT Voltage Transformer 380/400V 100VA | 11253
Tameson.com
$95.29
ETI CT Voltage Transformer 380/400V 100VA | 11253
Tameson.com
$16.32
Triad Magnetics TCT40-01E07AE-15 Chassis Mount Transformer, 40Va | Chassis Mount Transformers
Newark
$16.32
Triad Magnetics TCT40-01E07AE-15 Chassis Mount Transformer, 40Va | Chassis Mount Transformers
Newark
$27.99
OSD SP70T 70V Commercial Transformer
Crutchfield
$27.99
OSD SP70T 70V Commercial Transformer
Crutchfield
$109.90
VEVOR 5000Va Voltage Auto Converter Transformer, Heavy Duty Step Up/Down 110V To 220V & 220V To 110V, 3 Us & 3 Eu Outlets, Lcd Display, Circuit Breake
VEVOR
516
$109.90
VEVOR 5000Va Voltage Auto Converter Transformer, Heavy Duty Step Up/Down 110V To 220V & 220V To 110V, 3 Us & 3 Eu Outlets, Lcd Display, Circuit Breake
VEVOR
$826.19
Bakers Pride 2E-M1376A OEM Transformer, 240/480V,Kva>0.25
WebstaurantStore
$826.19
Bakers Pride 2E-M1376A OEM Transformer, 240/480V,Kva>0.25
WebstaurantStore

Shop power transformer

Sponsored
About our ads
$1,027.42
Hammond Power Solutions C1F007LES - Transformer 7.5Kva 240X480v-120/240V
Essential Electric Supply
25% off
$1,027.42
Hammond Power Solutions C1F007LES - Transformer 7.5Kva 240X480v-120/240V
Essential Electric Supply
$1,805.47
$2,457.00
Hammond Power Solutions SG3A0015KB - 3-Phase Transformer 15Kva 480D-208Y/120V
Essential Electric Supply
26% off
$1,805.47
$2,457.00
Hammond Power Solutions SG3A0015KB - 3-Phase Transformer 15Kva 480D-208Y/120V
Essential Electric Supply
$2,533.64
Hammond Power Solutions SG3A0015KB0C - 3-Phase Transformer 15Kva 480D-208Y/120V
Essential Electric Supply
26% off
$2,533.64
Hammond Power Solutions SG3A0015KB0C - 3-Phase Transformer 15Kva 480D-208Y/120V
Essential Electric Supply
$2,639.25
3-Phase Autotransformer 600-480-400-240-208V
Maddox
$2,639.25
3-Phase Autotransformer 600-480-400-240-208V
Maddox
$1,945.00
1-Phase 240X480 - 120/240 25 Kva Transformer
Maddox
$1,945.00
1-Phase 240X480 - 120/240 25 Kva Transformer
Maddox
$924.84
Middleby 31504 Transformer - 240/480V Primary 120V Secondary - 200Va - Transformers
Parts Town
$924.84
Middleby 31504 Transformer - 240/480V Primary 120V Secondary - 200Va - Transformers
Parts Town
$359.55
Aaon P50591 Transformer - 240-480 To 120-240V - 1.5Kva - Transformers
Parts Town
Free shipping
$359.55
Aaon P50591 Transformer - 240-480 To 120-240V - 1.5Kva - Transformers
Parts Town
$2,736.00
T3030K0013B HUBBELL - Transformers & Dry Transformer Supplies
Radwell.com
$2,736.00
T3030K0013B HUBBELL - Transformers & Dry Transformer Supplies
Radwell.com
$2,453.13
3-Phase 480V Delta - 208 Y 120 45 Kva Transformer | New
Maddox
$2,453.13
3-Phase 480V Delta - 208 Y 120 45 Kva Transformer | New
Maddox
$585.75
9T51B0145 GENERAL ELECTRIC - Transformers & Dry Transformer Supplies
Radwell.com
$585.75
9T51B0145 GENERAL ELECTRIC - Transformers & Dry Transformer Supplies
Radwell.com
$50.04
Functional Devices | TR100VA001 | Transformer 100Va, 120 To 24 Vac, Circuit Breaker, Foot And Single Threaded Hub Mount
Kele
$50.04
Functional Devices | TR100VA001 | Transformer 100Va, 120 To 24 Vac, Circuit Breaker, Foot And Single Threaded Hub Mount
Kele
$128.25
B100LP7JK MICRON INDUSTRIES CORPORATION - Transformers & Control Transformer Supplies
Radwell.com
$128.25
B100LP7JK MICRON INDUSTRIES CORPORATION - Transformers & Control Transformer Supplies
Radwell.com
$33.67
Honeywell - AT140A1018 - 40 VA General Purpose Transformers Power 24 Vac Circuits | Skip The Warehouse
Skip The Warehouse
$33.67
Honeywell - AT140A1018 - 40 VA General Purpose Transformers Power 24 Vac Circuits | Skip The Warehouse
Skip The Warehouse
$68.50
Arzel TRANS40VARS 40 Amp Transformer | Skip The Warehouse
Skip The Warehouse
$68.50
Arzel TRANS40VARS 40 Amp Transformer | Skip The Warehouse
Skip The Warehouse
$290.00
Siemens 4AM6142-8DD40-0FA0 SITAS Transformer, 1-Phase
PLCHardware.com
$290.00
Siemens 4AM6142-8DD40-0FA0 SITAS Transformer, 1-Phase
PLCHardware.com
$792.24
Hobart 00-294500-00053 OEM Transformer,500Va,50/60 Hz
WebstaurantStore
$792.24
Hobart 00-294500-00053 OEM Transformer,500Va,50/60 Hz
WebstaurantStore
$146.32
9070T50D1 Square D Control Transformer
Standard Electric Supply Co.
1
$146.32
9070T50D1 Square D Control Transformer
Standard Electric Supply Co.
$113.03
$216.00
MT0100A Siemens Control Transformer
Standard Electric Supply Co.
2
47% off
$113.03
$216.00
MT0100A Siemens Control Transformer
Standard Electric Supply Co.