Siemens REF3B080 EF3B080 - 80A 3 Pole Molded Case Circuit Breaker
- 80A
- 3 Pole
- Bolt-On
Siemens
REF3B080
EF3B080 - 80A 3 Pole Molded Case Circuit Breaker
Brand
Siemens
SKU
REF3B080
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Siemens EF3B080 - 80A 3 Pole Molded Case Circuit Breaker
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Description
Serving as a legacy 3-pole, 80A molded case circuit breaker from Siemens, the REF3B080 provides essential long-time and instantaneous (LI) trip functions. Built for commercial applications, it maintains safety in aging electrical systems. Designed with a bolt-on mounting style, this E-frame breaker installs into classic Siemens and I-T-E panelboards. It acts as a cross-reference for older EF3B080 units and is officially replaced by the modern ED63B080. The unit features a 14 kAIC rating at 480V.Specifications
| Brand | Siemens |
|---|---|
| Part Number | REF3B080-R |
| Series | EF |
| Amperage | 80A |
| Poles | 3 |
| Mounting Style | Bolt-On |
| Voltage | 240VAC, 480VAC, 600VAC, 250VDC |
| Phase | 3 |
| AIC Rating | 18kA @ 240VAC, 14kA @ 480VAC, 14kA @ 600VAC, 10kA @ 250VDC |
| Terminal Type | Lugs |
|---|---|
| For Use With | Siemens / I-T-E Panelboards, Switchboards |
| Wire Gauge | 10-1/0 AWG (Cu/Al) |
| Max Wire | 1/0 AWG |
| Min Wire | 10 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, Alarm Switch, Undervoltage Release |
|---|---|
| Accessories | Lugs |
| Standards | NEMA AB-1, UL 489 |
| Approval | CSA, UL |
| Temp Rating | 40C |
| Construction Features | Non-Interchangeable Trip |
Product FAQs
6 answersWhich panelboards are compatible with the Siemens EF3B080 circuit breaker?
This legacy E-frame breaker is designed for bolt-on installation in Siemens P1, P2, and P3 panelboards, as well as older I-T-E panelboards and switchboards.
What is the modern replacement for the obsolete EF3B080?
When upgrading or replacing this legacy unit, technicians typically use the modern Siemens ED63B080 molded case circuit breaker as a direct substitute.
Are the trip settings on the EF3B080 adjustable?
No, this thermal magnetic breaker features fixed thermal and fixed magnetic trip settings for its long-time and instantaneous protection functions.
What mounting hardware is required to install this breaker as a main or sub-feed?
Installing this 3-phase E-frame breaker into a Siemens panelboard often requires a specific OEM mounting hardware kit, such as the MBKED3, to securely fasten the unit to the bus.
Is the EF3B080 suitable for HVAC applications?
Yes, this breaker is HACR rated, making it suitable for use with heating, air conditioning, and refrigeration equipment that requires dedicated circuit protection.
Can the trip unit on the EF3B080 be swapped or upgraded in the field?
No, this breaker is constructed with a non-interchangeable trip unit. The thermal magnetic protection functions are factory set and cannot be modified.
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