Zinsco / Sylvania SJD2C250 Molded Case Circuit Breaker
- 250A
- 2 Pole
- Unit Mount
Quantity
Zinsco / Sylvania SJD2C250 - 250A 2 Pole Molded Case Circuit Breaker
Re-Certified
Quantity
Description
Designed to maintain aging electrical infrastructure, this 250-amp molded case circuit breaker provides essential overcurrent protection for commercial operations. The unit mounts seamlessly into legacy Sylvania, Challenger, and Westinghouse panelboards, acting as a verified cross-reference for the JDB2250. Equipped with standard long-time and instantaneous trip functions, the breaker handles 10kA fault currents at 240V while accommodating 4 AWG to 350 kcmil wiring through standard lugs.Specifications
| Brand | Zinsco / Sylvania |
|---|---|
| Part Number | SJD2C250 |
| Series | SJD |
| Amperage | 250A |
| Poles | 2 |
| Mounting Style | Unit Mount |
| Voltage | 240VAC |
| Phase | 1 |
| AIC Rating | 10kA @ 240VAC |
| Terminal Type | Lugs |
|---|---|
| For Use With | Sylvania Panelboards, Challenger Panelboards, Westinghouse Panelboards, Eaton Panelboards |
| Wire Gauge | 4 AWG - 350 kcmil |
| Max Wire | 350 kcmil |
| Min Wire | 4 AWG |
| Trip Technology | Thermal Magnetic |
|---|---|
| Trip Function Code | LI |
| Trip Function | Long-Time, Instantaneous |
| Trip Adjustability | Fixed Thermal, Adjustable Magnetic |
| Available Options | Shunt Trip, Auxiliary Switch, Undervoltage Release |
|---|---|
| Accessories | Lugs Not Included |
| Standards | UL 489 |
| Approval | UL |
| Temp Rating | 40°C |
| Construction Features | HACR Rated |
Product FAQs
6 answersWhich panelboards are compatible with the SJD2C250 circuit breaker?
The SJD2C250 is designed for use in compatible Sylvania, Challenger, Westinghouse, and Eaton panelboards that accept SJD-series unit-mount breakers.
What wire sizes are accepted by the lugs on the SJD2C250?
The terminal lugs on this breaker accept wire sizes ranging from 4 AWG to 350 kcmil. Always verify the conductor material and apply the correct torque during installation.
Is the magnetic trip adjustable on the SJD2C250?
Yes, this thermal-magnetic breaker features a fixed thermal element for overload protection and an adjustable magnetic trip for short-circuit protection, allowing electricians to fine-tune the instantaneous trip response.
Can I use the SJD2C250 to replace older Zinsco or Challenger SJD breakers?
Yes, this breaker serves as a direct replacement for legacy Zinsco, Sylvania, and Challenger SJD-series 250A 2-pole breakers. Because Eaton acquired the Challenger line, select Eaton panelboards also support this series.
How does the SJD2C250 protect panelboards and connected circuits?
It utilizes a thermal-magnetic trip unit with long-time and instantaneous functions to safely interrupt overloads and short circuits, preventing wire damage and electrical hazards.
How is the SJD2C250 mounted?
This breaker features a unit-mount design, meaning it is installed individually using mounting hardware rather than plugging directly into a bus bar. Line and load connections are made via the terminal lugs.
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