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Siemens EF3M020 Molded Case Circuit Breaker
- 20A
- 3 Pole
- Bolt-On
Siemens
EF3M020
Molded Case Circuit Breaker
Brand
Siemens
SKU
EF3M020
Quantity
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Siemens EF3M020 - 20A 3 Pole Molded Case Circuit Breaker
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Description
Designed for heavy-duty power distribution, the Siemens EF3M020 is a 20-amp, 3-pole molded case circuit breaker. It utilizes fixed thermal-magnetic trip technology to deliver consistent long-time and instantaneous protection. This E-Frame breaker mounts into Siemens P1, P2, and P3 panelboards, offering seamless integration for existing infrastructure. For modern upgrades, this unit crosses over to the ED63B020 replacement. It features a 600VAC rating with a 14kAIC capacity at 480V.Specifications
| Brand | Siemens |
|---|---|
| Part Number | EF3M020-R |
| Series | EF |
| Amperage | 20A |
| Poles | 3 |
| Mounting Style | Bolt-On |
| Voltage | 600VAC, 250VDC |
| Phase | 3 |
| AIC Rating | 18kA @ 240VAC, 14kA @ 480VAC, 14kA @ 600VAC, 10kA @ 250VDC |
| Frame Type | EF |
|---|---|
| Terminal Type | Lugs |
| For Use With | Siemens P1, P2, P3 Panelboards, Legacy I-T-E Panelboards |
| Wire Gauge | 14-10 AWG (Cu), 12-10 AWG (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, Undervoltage Release, Alarm Switch |
|---|---|
| Accessories | Load Side Lugs Included |
| Standards | UL 489, CSA C22.2 No. 5, UL 489 Supplement SB (Marine) |
| Approval | CSA, UL, UL Marine |
| Temp Rating | 50C |
| Construction Features | HACR Rated, Non-Interchangeable Trip, 50C Ambient Calibration |
Product FAQs
8 answersWhich panelboards accept the EF3M020 circuit breaker?
This legacy E-Frame breaker is designed to bolt into Siemens P1, P2, and P3 panelboards. It is also fully compatible with older legacy I-T-E panelboards.
What is the modern direct replacement for the EF3M020?
For new installations or modern panel upgrades, the EF3M020 crosses over to the Siemens ED63B020 molded case circuit breaker.
What are the acceptable wire sizes for the EF3M020 load lugs?
The factory-installed load side lugs are rated for 14 to 10 AWG copper (Cu) conductors and 12 to 10 AWG aluminum (Al) conductors.
Does the EF3M020 support direct current (DC) systems?
Yes, in addition to its AC ratings, this breaker is rated for 250VDC systems with a 10kA interrupting capacity.
Are the thermal and magnetic trip settings adjustable?
No, the EF3M020 features a non-interchangeable trip unit with fixed thermal and fixed magnetic settings for long-time and instantaneous protection.
Is the EF3M020 suitable for heating and cooling equipment?
Yes, this breaker is HACR rated, ensuring it meets the specific testing requirements for heating, air conditioning, and refrigeration motor loads.
What is the ambient calibration temperature for the EF3M020?
This breaker is calibrated for a 50 degrees Celsius (122 degrees Fahrenheit) ambient operating temperature, which is standard for many industrial and marine applications.
Is the EF3M020 approved for marine environments?
Yes, this breaker meets UL 489 Supplement SB standards and carries a UL Marine approval, making it suitable for marine power distribution.
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Reviews
Review summary
Customers rate this product 5.0 out of 5 based on 2 reviews.
Total 5 star reviews: 2 Total 4 star reviews: 0 Total 3 star reviews: 0 Total 2 star reviews: 0 Total 1 star reviews: 0
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Rating
2 reviews
- VGVictor G.Verified BuyerRated 5 out of 5 stars11/6/25Breakers fit my needs
I wish I would of shopped this I found exact breaker for 400.00 cheaper
- RFRobert F.ReviewingSiemens EF3A100 - 100A 3 Pole Motor Circuit ProtectorI recommend this productRated 5 out of 5 stars7/25/22Fast order and service for a part in good condition
Fast order and service for a part in good condition.