Schneider Electric / Merlin Gerin NSF250N Molded Case Circuit Breaker
- 250A
- 3 Pole
- Unit Mount
Quantity
Schneider Electric / Merlin Gerin NSF250N - 250A 3 Pole Molded Case Circuit Breaker
Re-Certified
Quantity
Description
Built for commercial power systems, this 250A molded case circuit breaker from Schneider Electric delivers dependable thermal-magnetic protection. The 3-pole device is part of the legacy Merlin Gerin Compact NSF family. Designed for unit mount configurations, it integrates seamlessly into Compact NSF panelboards and switchboards. For newer installations, this model crosses over to the C25N3TM250 replacement. It features a 35kAIC rating at 480VAC and adjustable magnetic LI trip functions.Specifications
| Brand | Schneider Electric / Merlin Gerin |
|---|---|
| Part Number | NSF250N-R |
| Series | NSF |
| Amperage | 250A |
| Poles | 3 |
| Mounting Style | Unit Mount |
| Voltage | 240VAC, 480VAC, 600Y/347VAC |
| Phase | 3 |
| AIC Rating | 65kA @ 240VAC, 35kA @ 480VAC, 18kA @ 600Y/347VAC |
| Terminal Type | Lugs |
|---|---|
| For Use With | Merlin Gerin Compact NSF Panelboards, Switchboards |
| Wire Gauge | 2/0 AWG-250 kcmil (Cu), 4/0 AWG-350 kcmil (Al) |
| Max Wire | 250 kcmil (Cu) / 350 kcmil (Al) |
| Min Wire | 2/0 AWG (Cu) / 4/0 AWG (Al) |
| Trip Technology | Thermal Magnetic |
|---|---|
| Trip Function Code | LI |
| Trip Function | Long-Time, Instantaneous |
| Trip Adjustability | Adjustable Thermal, Adjustable Magnetic |
| Available Options | Shunt Trip, Auxiliary Switch, Undervoltage Release, Alarm Switch, Rotary Handle |
|---|---|
| Accessories | Lug Kit |
| Standards | CSA C22.2 No. 5, IEC 60947-2, UL 489 |
| Approval | CSA, IEC, UL |
| Temp Rating | 40C |
| Construction Features | Current Limiting |
Product FAQs
5 answersWhat enclosures or panelboards are compatible with the NSF250N circuit breaker?
The NSF250N is designed for unit-mount installations specifically within Merlin Gerin Compact NSF panelboards and commercial switchboards.
What does the N in the NSF250N catalog number signify?
The N designates the standard interrupting capacity for the Compact NS frame. This specific rating provides a 35kA short-circuit threshold at 480V AC, distinguishing it from high or current-limiting variants in the same family.
How does the adjustable thermal-magnetic trip unit function on this breaker?
The NSF250N features adjustable Long-Time and Instantaneous trip settings. This allows panel builders to fine-tune the thermal response for continuous current overloads and the magnetic response for short-circuit protection to match specific load requirements.
What are the conductor requirements for the NSF250N lugs?
The factory lugs require different wire ranges depending on the conductor material. They accept 2/0 AWG to 250 kcmil for copper wire, and 4/0 AWG to 350 kcmil for aluminum wire.
Is the Merlin Gerin NSF250N interchangeable with Square D NSF frames?
Yes, Merlin Gerin and Square D share the Compact NS family architecture under the Schneider Electric parent brand. The NSF250N can replace equivalent legacy NSF frame breakers in existing distribution systems.
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