ST CLB Circuit Breaker Block - 12 Position. Features. Quick connect clips allow circuit breakers to snap easily into place. Tin-plated copper busses and screw terminals. Clear insulating cover with square format label recesses, satisfies ABYC/USCG insulation requirements. Easy to open clip on cover. Breakouts allow wire access in two directions. Accepts ring terminals. Optional push button waterproof boots or dress nuts can be installed over cover. Specifications:. Circuits: 12. Maximum Amperage: 32A (per circuit) 40A (per jumped circuit group). Maximum Voltage: 32V DC. Mounting: #8 Screw (M4) or #8 Nut. Source: Independent SourceMinimum Operating Temperature: -10 C. Maximum Operating Temperature: 60 C. Mounting Centers: 10.13"(257.3 mm). Screw Terminal Type: #8-32 Screws with Captive Star Lock Washer. Height: 6.69"(169.93 mm). Weight: 1.50lb (0.68 kg). WARNING: This product can expose you to chemicals including di(2-ethylhexyl)phthalate (dehp) which is known to the State of California