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Grey moulded plastic single-pole circuit breaker rated 20 A 120/277 V AC

SIEMENS

SIEMENS ED41B020 Circuit Breaker 20A 1 Pole 120/277V

SKU CH-51QM-6CXQ0

A 20 A single-pole molded-case breaker rated 120/277 V AC with 22 kA interrupting capacity and thermal-magnetic trip

  • 20 A trip rating protects single-phase circuits
  • 22 kA interrupting capacity at 277 V AC handles high fault currents
  • Thermal-magnetic trip mechanism responds to overloads and short circuits
  • Lug-in mounting fits Sentron panelboards and SB switchboards
  • 125 V DC rating extends use to low-voltage DC applications

SIEMENS ED41B020 20A Circuit Breaker

The SIEMENS ED41B020 is a molded case circuit breaker rated at 20 amps for single-phase protection. It suits panel builders and maintenance electricians fitting standard thermal-magnetic protection into compatible power distribution assemblies.

Lug-in panelboard mounting with load-side lugs

The breaker uses a lug-in mounting style designed for SB switchboards and Sentron panelboards. Load-side lug terminals accept standard cable connections, while the 125 amp frame size ensures physical compatibility with the intended enclosure slots.

22kA interrupting rating at 277V AC

The maximum AIR rating of 22kA at 277V AC defines the fault-current capability this device can safely interrupt. Buyers needing a higher interrupting capacity for the same frame must select a different series.

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Price $542.99
Pricier than about 90% of the 1,135 comparable items (median $54.99).

Specifications

Product
Brand nameSIEMENS

Questions about this item

What voltage does the 120/277 V AC rating allow the ED41B020 to protect?

The breaker is rated for 120/277 V AC single-phase circuits and 125 V DC, with a maximum interrupting rating of 22 kA at 277 V AC.

What panelboard space and mounting style does the ED4 frame require?

It uses a lug-in mounting style in a 125 A ED frame and fits Sentron panelboards and SB switchboards designed for that frame size.

How is the ED41B020 installed and which wiring step is often missed?

Mount the breaker in the panelboard, torque the load-side lug to the specified value, and verify the thermal-magnetic trip unit is set to the 20 A fixed instantaneous setting.

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