Challenger / Sylvania / Zinsco SF2C175 Molded Case Circuit Breaker
- 175A
- 2 Pole
- Bolt-On
Quantity
Challenger / Sylvania / Zinsco SF2C175 - 175A 2 Pole Molded Case Circuit Breaker
Re-Certified
Quantity
Description
Part of the legacy SF series, the Zinsco SF2C175 is a 175-amp, 2-pole molded case circuit breaker. It utilizes fixed thermal-magnetic technology for reliable commercial protection. Designed as an exact hardware match, this bolt-on breaker mounts into existing Challenger, Sylvania, and Zinsco panelboards. It eliminates complex adapters and crosses to the Eaton FD2175. With a 25kAIC rating at 480V, it handles demanding fault currents. The unit features standard lug terminals and is HACR rated.Specifications
| Brand | Challenger / Sylvania / Zinsco |
|---|---|
| Part Number | SF2C175-R |
| Series | SF |
| Amperage | 175A |
| Poles | 2 |
| Mounting Style | Bolt-On |
| Voltage | 240VAC, 480VAC |
| Phase | 1 |
| AIC Rating | 65kA @ 240VAC, 25kA @ 480VAC |
| Frame Type | SF |
|---|---|
| Terminal Type | Lugs |
| For Use With | Challenger Panelboards, Sylvania Panelboards, Zinsco Panelboards |
| 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, Alarm Switch |
|---|---|
| Accessories | Line and Load Lugs Included |
| Standards | UL 489 |
| Approval | UL |
| Temp Rating | 40°C |
| Construction Features | HACR Rated |
Product FAQs
6 answersWhich panelboards are compatible with the SF2C175 circuit breaker?
This breaker is designed exclusively for legacy Challenger, Sylvania, and Zinsco panelboards that accept SF frame or F-frame molded case circuit breakers. Always verify your panelboard labeling to confirm frame compatibility before installation.
How is the SF2C175 secured to the panelboard bus?
It utilizes a bolt-on connection. The breaker bolts directly to the panelboard busbars, providing a highly secure mechanical and electrical connection that is typical for commercial and industrial applications.
Can the SF2C175 be installed in a 240V AC electrical system?
Yes. While it has a maximum voltage rating of 480V AC with a 25kA interrupting capacity, it is fully compatible with 240V AC systems. When applied at 240V AC, the breaker delivers a higher interrupting rating of 65kA.
What type of fault protection does the fixed thermal-magnetic trip unit provide?
The fixed thermal-magnetic trip unit delivers standard LI (Long-Time and Instantaneous) protection. The thermal component prevents overheating from sustained overloads, while the magnetic component trips immediately to clear severe short circuits.
Is this breaker a direct replacement for older Challenger SF frame breakers?
Yes, this unit serves as an exact replacement for original 175-amp, 2-pole Challenger, Sylvania, or Zinsco SF frame breakers. This allows you to maintain existing legacy panelboards without requiring a full system upgrade.
Why is Eaton or Cutler-Hammer listed as the parent brand for this Challenger breaker?
Eaton acquired the Challenger and Cutler-Hammer product lines. While this specific breaker retains the legacy Challenger, Sylvania, or Zinsco branding, Eaton now oversees the manufacturing and support for these legacy molded case circuit breakers.
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