Zinsco / Sylvania SEH3C090 Molded Case Circuit Breaker
- 90A
- 3 Pole
- Bolt-On
Quantity
Zinsco / Sylvania SEH3C090 - 90A 3 Pole Molded Case Circuit Breaker
Re-Certified
Quantity
Description
A drop-in replacement for aging systems, the Zinsco SEH3C090 is a 90A, 3-pole molded case circuit breaker. It fits legacy Sylvania, Challenger, and Westinghouse panelboards. This bolt-on MCCB installs without aftermarket adapters. For modern upgrades, this unit crosses over to the Eaton EHD3090, ensuring a clear path for future maintenance. Rated for 14kAIC at 480VAC, it features fixed thermal-magnetic trip technology. The breaker provides dependable long-time and instantaneous protection.Specifications
| Brand | Zinsco / Sylvania |
|---|---|
| Part Number | SEH3C090-R |
| Series | SEH |
| Amperage | 90A |
| 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 | Sylvania Panelboards, Challenger Panelboards, Westinghouse Panelboards, Eaton 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 | Lugs Not 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 SEH3C090 breaker?
This bolt-on breaker is designed for use in legacy Sylvania panelboards. Due to historical manufacturer acquisitions, it is also compatible with specific Challenger, Westinghouse, and Eaton panelboards that accept SEH frame breakers.
What are the acceptable wire sizes for the lugs on the SEH3C090?
The terminals accept wire gauges from 14 AWG up to 1/0 AWG. Both aluminum and copper conductors are supported. Always apply an approved oxide inhibitor when terminating aluminum wiring.
Can this breaker replace Challenger or Westinghouse SEH frame breakers?
Yes. Because Sylvania, Challenger, and Westinghouse shared manufacturing designs for this frame type before being acquired by Eaton, the SEH3C090 serves as a direct replacement for those legacy SEH breakers with matching specifications.
Does the SEH3C090 feature adjustable trip settings?
No. This breaker utilizes a thermal magnetic trip unit with fixed long-time and fixed instantaneous protection functions.
What should be inspected before installing this bolt-on breaker in a legacy panel?
Before bolting the breaker to the bus, inspect the panelboard busbars for signs of pitting, arcing, or severe oxidation. Legacy panels often require thorough cleaning of the contact surfaces to ensure a secure, low-resistance connection.
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