Siemens REF3B030 EF3B030 - 30A 3 Pole Molded Case Circuit Breaker
- 30A
- 3 Pole
- Bolt-On
Siemens
REF3B030
EF3B030 - 30A 3 Pole Molded Case Circuit Breaker
Brand
Siemens
SKU
REF3B030
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Siemens EF3B030 - 30A 3 Pole Molded Case Circuit Breaker
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Description
Designed to maintain existing infrastructure, the Siemens REF3B030 is a 3-pole, 30A molded case circuit breaker from the classic EF frame family. It provides essential overcurrent protection for industrial switchboards. This bolt-on MCCB is compatible with vintage Siemens and I-T-E enclosures, serving as a substitute for the original EF3B030. Rated for 600VAC, the breaker features a non-interchangeable thermal-magnetic trip unit and delivers a standard interrupting capacity of 14kAIC at 480V.Specifications
| Brand | Siemens |
|---|---|
| Part Number | REF3B030-R |
| Series | EF |
| Amperage | 30A |
| Poles | 3 |
| Mounting Style | Bolt-On |
| Voltage | 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 | 14-10 AWG (Cu/Al) |
| Max Wire | 10 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, Alarm Switch, Undervoltage Release |
|---|---|
| Accessories | Load Side Lugs Included |
| Standards | NEMA AB-1, UL 489 |
| Approval | CSA, UL |
| Temp Rating | 40C |
| Construction Features | Non-Interchangeable Trip |
Product FAQs
4 answersWhich panelboards accept the Siemens EF3B030 circuit breaker?
This legacy E-frame breaker is designed for bolt-on installation in older Siemens and I-T-E panelboards and switchboards. It provides an exact physical match for maintaining existing infrastructure.
What is the modern replacement for the EF3B030?
For newer installations or panel upgrades, the EF3B030 is replaced by the Siemens ED63B030. The ED63B030 is an ED-frame breaker that fits modern P1, P2, and P3 panelboards while offering updated interrupting ratings.
What wire sizes are compatible with the EF3B030 load lugs?
The factory-installed load-side lug terminals accept 14 AWG to 10 AWG copper or aluminum conductors.
What type of protection does the EF3B030 trip unit provide?
It features a fixed thermal-magnetic trip unit with long-time and instantaneous (LI) functions. The trip unit is non-interchangeable and provides standard overload and short-circuit protection.
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