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Siemens ED4 three-pole molded case breaker, grey housing, lug terminals

SIEMENS

SIEMENS ED43B020 Molded Case Circuit Breaker 20A 3 Pole 480V AC

SKU CH-27T1-8DA83

Three-pole molded-case breaker rated 20 A at 480 V AC with 18 kA interrupting capacity for panelboard mounting

  • 20 A thermal-magnetic trip protects three-phase circuits
  • 480 V AC rating suits commercial panelboards
  • 18 kA interrupting capacity clears heavy faults
  • Lug-in mounting fits Sentron and SB switchboards
  • 125 A frame size matches ED4 series dimensions

ED43B020 Molded Case Circuit Breaker

The SIEMENS ED43B020 is a 20 A molded case circuit breaker from the ED4 series designed for three-phase AC systems rated at 480 V. It uses a thermal-magnetic trip unit with fixed instantaneous settings and both high and low amp trip points set at 20 A. The breaker mounts lug-in on panelboards and carries a maximum AIR rating of 18 kA at 480 V AC.

Verify panelboard compatibility and voltage

Confirm that the existing panelboard accepts ED4 frame breakers rated at 125 A frame size and that the system voltage is 480 V AC three-phase. The breaker requires lug-in mounting style and load-side lug terminals on the panelboard bus. DC voltage is not rated so this unit must not be used on DC circuits. Ensure the available fault current does not exceed the 18 kA interrupting rating at 480 V.

Replaces standard thermal-magnetic ED4 breakers

This unit directly replaces other ED4 series three-pole breakers with the same 20 A trip setting and lug-in mounting when the panelboard is a Sentron or SB switchboard type. The upgrade is worthwhile when the existing breaker has a lower interrupting rating or when a fixed instantaneous trip is preferred over adjustable alternatives. It does not suit applications requiring DC rating or adjustable trip curves.

How it compares

Measured against everything we stock in Breakers & Circuit Protection, at today’s prices. Recalculated every night.

Price $1,536.99
Pricier than about 93% of the 1,135 comparable items (median $54.99).

Specifications

Product
Brand nameSIEMENS

Questions about this item

Does the SIEMENS ED43B020 come with load-side lugs, or must I order terminals separately?

The breaker is supplied with load-side lugs already fitted, so no separate terminal kit is required for standard panelboard installation.

Should I select the ED43B020 or a different ED4 frame size for a 20 A three-phase 480 V AC branch circuit?

The ED43B020 is the 20 A, 3-pole, 480 V AC model in the 125 A ED frame, making it the correct choice for that branch circuit.

What does the 18 kA AIR rating mean when the breaker is installed in a 480 V AC panelboard?

It indicates the breaker can safely interrupt up to 18 kA of available fault current at 480 V AC without damage.

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