Zinsco / Sylvania SEH3C040 Molded Case Circuit Breaker
- 40A
- 3 Pole
- Bolt-On
Quantity
Zinsco / Sylvania SEH3C040 - 40A 3 Pole Molded Case Circuit Breaker
Re-Certified
Quantity
Description
Part of the legacy SEH series, this 3-pole 40A breaker provides essential thermal-magnetic protection for commercial facilities. It handles up to 480VAC and features fixed long-time and instantaneous trip functions. Designed for exact fitment, it bolts into discontinued Sylvania, Challenger, and Westinghouse panelboards without adapters. It also fits Eaton F-Frame systems and is cross-referenced by the EHD3040. This unit delivers an 18kAIC rating at 240V and includes load side lugs.Specifications
| Brand | Zinsco / Sylvania |
|---|---|
| Part Number | SEH3C040-R |
| Series | SEH |
| Amperage | 40A |
| Poles | 3 |
| Mounting Style | Bolt-On |
| Voltage | 240VAC, 480VAC |
| Phase | 3 |
| AIC Rating | 18kA @ 240VAC, 14kA @ 480VAC |
| Frame Type | SEH |
|---|---|
| Terminal Type | Lugs |
| For Use With | Eaton F-Frame Panelboards, Sylvania Panelboards, Challenger Panelboards, Westinghouse Panelboards |
| Wire Gauge | 14 AWG - 1/0 AWG (Al/Cu) |
| Max Wire | 1/0 AWG |
| Min Wire | 14 AWG |
| Trip Technology | Thermal Magnetic |
|---|---|
| Trip Function Code | LI |
| Trip Function | Long-Time, Instantaneous |
| Trip Adjustability | Fixed Thermal, Fixed Magnetic |
| Available Options | Shunt Trip, Auxiliary Switch, Undervoltage Release |
|---|---|
| Accessories | Load Side Lugs Included |
| Standards | UL 489, NEMA AB 1 |
| Approval | UL |
| Temp Rating | 40C |
| Construction Features | HACR Rated |
Product FAQs
5 answersWhich panelboards are compatible with the SEH3C040 circuit breaker?
This breaker is designed to bolt directly into legacy Sylvania, Challenger, and Westinghouse panelboards. It is also compatible with modern Eaton F-Frame systems without requiring adapters.
Is there a modern cross-reference or replacement for the Sylvania SEH3C040?
Yes. The Eaton EHD3040 is a direct cross-reference for this 40-amp, 3-pole breaker and fits the same F-Frame panelboards.
Can this breaker be used in 240V systems, and what is the interrupting rating?
Yes, while it is rated for up to 480V AC, it can be safely applied in 240V AC systems where it provides a higher interrupting capacity of 18,000 amps (18kAIC).
Will this breaker fit in a standard residential load center?
No. The SEH3C040 is a commercial molded case circuit breaker with a bolt-on connection designed specifically for F-Frame panelboards. It will not fit in standard plug-on residential load centers.
Why is this breaker listed under multiple brands like Zinsco, Sylvania, and Challenger?
Through various corporate acquisitions, the SEH frame design was manufactured and branded by Zinsco, GTE Sylvania, and Challenger. Breakers with the SEH3C040 part number from these legacy brands are physically and electrically identical.
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