Siemens MP22020 20/20A Triplex Miniature Circuit Breaker

The 20/20A rating is the current rating used for overcurrent protection selection. Match it to the circuit's load and conductor protection requirements, rather than selecting by voltage alone.

The MP22020 is rated for 120/240VAC, single-phase service. Use these ratings to check the circuit's voltage and phase when selecting protection.

The interrupting rating is 10kAIC at 120/240VAC. Available fault current at the installation point must not exceed that rating; the interrupting rating concerns fault-clearing capability, not normal load current.

Thermal-magnetic protection combines a long-time response to sustained overcurrent with an instantaneous response to high fault current. Both the thermal and magnetic trip settings are fixed, so select the breaker rating rather than planning to adjust its trip settings.

The breaker uses plug-on mounting and a load-side lug for the outgoing conductor. These are separate installation interfaces: the plug-on connection mounts the breaker, while the lug terminates the load wire.

The wire range is 14-8 AWG. Select a conductor within that terminal range that also meets the circuit's ampacity requirements; terminal acceptance alone does not determine conductor sizing.

A neutral connection to the breaker is not applicable. Keep any circuit neutral routing separate from the breaker's load-side lug connections.

HACR refers to heating, air-conditioning and refrigeration applications. The marking is relevant when selecting overcurrent protection for those types of loads.

SWD means switch duty and relates to switching fluorescent lighting loads. Use this marking when selecting a breaker that will also serve as the switching device for that type of load.