Siemens / ITE F3B050M Molded Case Circuit Breaker
- 50A
- 3 Pole
- Bolt-On
Quantity
Siemens / ITE F3B050M - 50A 3 Pole Molded Case Circuit Breaker
Re-Certified
Quantity
Description
Engineered for commercial motor circuit protection, this 3-pole legacy MCCB integrates seamlessly with older ITE and Siemens E-Frame panelboards. This bolt-on breaker mounts securely into existing enclosures without adapters. For facilities upgrading infrastructure, it is officially replaced by the Siemens ED63B050 model. Featuring magnetic-only trip technology, the F3B050M delivers precise short-circuit protection for motor loads with a 25kAIC rating at 240VAC.Specifications
| Brand | Siemens / ITE |
|---|---|
| Part Number | F3B050M-R |
| Series | F3B |
| Amperage | 50A |
| Poles | 3 |
| Mounting Style | Bolt-On |
| Voltage | 240VAC, 480VAC, 600VAC, 250VDC |
| Phase | 3 |
| AIC Rating | 25kA @ 240VAC, 14kA @ 480VAC, 14kA @ 600VAC, 10kA @ 250VDC |
| Frame Type | F |
|---|---|
| Terminal Type | Lugs |
| For Use With | ITE / Siemens E-Frame Panelboards |
| Wire Gauge | 14-1/0 AWG (Cu/Al) |
| Max Wire | 1/0 AWG |
| Min Wire | 14 AWG |
| Trip Technology | Magnetic Only |
|---|---|
| Trip Function Code | I |
| Trip Function | Instantaneous Only |
| Trip Adjustability | Adjustable Magnetic |
| Available Options | Shunt Trip, Auxiliary Switch, Undervoltage Release, Alarm Switch |
|---|---|
| Accessories | Line and Load Lugs Included |
| Standards | CSA C22.2 No. 5, NEMA AB-1, UL 489 |
| Approval | CSA, UL |
| Temp Rating | 40C |
| Construction Features | Motor Circuit Protector, Non-Interchangeable Trip |
Product FAQs
7 answersWhat type of protection does the F3B050M provide?
The F3B050M is a magnetic-only circuit breaker with an instantaneous trip function. It does not have a thermal overload element and is designed specifically for short-circuit protection in motor circuits, welding circuits, and combination starters.
Which panelboards accept the F3B050M circuit breaker?
This legacy F-frame breaker is designed to bolt directly into compatible ITE and Siemens E-Frame panelboards.
What wire sizes and materials are supported by the F3B050M terminals?
The factory-installed lugs accept conductor sizes from 14 AWG to 1/0 AWG. The terminals are dual-rated for both copper and aluminum wiring.
Is the Siemens F3B050M interchangeable with older ITE or Gould versions?
Yes. Siemens acquired the ITE and Gould circuit breaker divisions. A modern Siemens F3B050M is an exact physical and electrical replacement for legacy ITE and Gould breakers sharing the same catalog number.
Does the F3B050M require a specific mounting configuration?
Yes, this is a bolt-on circuit breaker. It must be bolted directly to the panelboard bus, which ensures a secure connection that resists loosening from the vibrations typically found in industrial motor applications.
Is the magnetic trip setting adjustable on the F3B050M?
Yes, the instantaneous magnetic trip unit is externally adjustable. This allows electricians to fine-tune the short-circuit trip threshold to match the specific inrush current characteristics of the connected motor.
Can the F3B050M be used as a standalone main breaker for a subpanel?
No. Because it features an instantaneous-only magnetic trip unit, it provides no thermal overload protection. It must be used in conjunction with a separate motor overload relay or thermal protection device to comply with electrical safety codes.
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