Siemens Q220HH Miniature Circuit Breaker

The "HH" designates an extra-high interrupting rating of 65kAIC at 120/240VAC. This is significantly higher than the standard Q220, which is rated at 10kAIC, and the Q220H, which is rated at 22kAIC.

Yes. Siemens acquired Murray and has officially phased out the brand. Siemens QP series breakers, including the Q220HH, are the UL-listed direct replacements for legacy Murray MP-T breakers with matching electrical specifications.

Yes, this breaker is HACR rated, meaning it is approved for use with heating, air conditioning, and refrigeration equipment that requires this specific safety designation.

For 14 to 10 AWG copper or aluminum conductors, the recommended terminal torque is 25 lb-in. If using 8 AWG wire, torque to 40 lb-in, and for 6 AWG wire, torque to 45 lb-in.

This plug-on breaker is compatible with Siemens EQ, PL, ES, and PN series load centers, as well as Siemens panelboards designed to accept standard 1-inch QP type branch circuit breakers.

Yes, this breaker includes Siemens Insta-Wire technology. The terminal screws are backed out at the factory, which speeds up installation by allowing immediate wire insertion.

As a 2-pole QP series breaker, the Q220HH requires two standard 1-inch spaces in a compatible load center or panelboard.