Siemens REF3B020 EF3B020 - 20A 3 Pole Molded Case Circuit Breaker
- 20A
- 3 Pole
- Bolt-On
Siemens
REF3B020
EF3B020 - 20A 3 Pole Molded Case Circuit Breaker
Brand
Siemens
SKU
REF3B020
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Siemens EF3B020 - 20A 3 Pole Molded Case Circuit Breaker
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Description
A drop-in replacement for older systems, the Siemens REF3B020 is a 20A, 3-pole molded case circuit breaker. It features a fixed thermal-magnetic trip unit with long-time and instantaneous functions to ensure reliable commercial and industrial circuit protection. Designed for bolt-on installation, it fits legacy Siemens and ITE panelboards and motor control centers. It replaces the EF3B020. This E-Frame breaker handles up to 600VAC and 250VDC, delivering 14kAIC at 480VAC.Specifications
| Brand | Siemens |
|---|---|
| Part Number | REF3B020-R |
| Series | EF Frame |
| Amperage | 20A |
| 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/ITE Panelboards, Motor Control Centers |
| Wire Gauge | 14-1/0 AWG (Cu), 12-1/0 AWG (Al) |
| Max Wire | 1/0 AWG |
| Min Wire | 14 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, Undervoltage Release, Alarm Switch |
|---|---|
| Accessories | Load Side Lugs |
| Standards | CSA C22.2 No. 5, NEMA AB-1, UL 489 |
| Approval | CSA, UL |
| Temp Rating | 40C |
| Construction Features | Non-Interchangeable Trip |
Product FAQs
5 answersWhat is the modern replacement for the legacy EF3B020 circuit breaker?
The EF3B020 is a legacy EF frame breaker. For system upgrades or new installations, it is typically replaced by the modern Siemens ED63B020 molded case circuit breaker.
Which specific enclosures and panelboards are compatible with the EF3B020?
In addition to standard Siemens and I-T-E motor control centers, this bolt-on breaker installs directly into legacy FC-1 panelboards and FC-20 switchboards.
Is the EF3B020 breaker HACR rated for HVAC applications?
Yes, this breaker carries an HACR rating, meaning it is tested and approved for use with commercial heating, air conditioning, and refrigeration equipment.
Can I install field-addable accessories like shunt trips on the EF3B020?
Yes, this EF frame breaker supports various internal accessories, including shunt trips, auxiliary switches, alarm switches, and undervoltage releases.
Can the trip unit on the EF3B020 be swapped or adjusted?
No, this breaker is built with a non-interchangeable trip unit. Both the long-time thermal and instantaneous magnetic trip functions are fixed and cannot be modified in the field.
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