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What size breaker do I need for the CHSPT2 surge protector?

In addition to installing a CHSPT2ULTRA or CHSPT2SURGE, it will need its own designated 2-pole 50Amp breaker . The CHSPT2 surge protector is tested with a 50 amp 2-pole breaker. The device, however, will work with any 2-pole branch breaker. Using a surge breaker in addition to the CHSPT2 device is not required. The published data may vary slightly if a different rated breaker is used.