Series 12X Shortstop Circuit Breakers Specifications Single Pole Thermal Type Breakers Applications: Battery chargers, trucks, buses, RVs, trolling motors, etc Rating: 5-50A, 14VDC 28VDC (Series 123, 124, & 125) Interrupt Rating: Main Circuit Protection: 1.5kA 12VDC (Series 123 w/plastic cover) Branch Circuit Protection: 2.5kA 12VDC (Series 121 & 124 -01 sealed & Series 123 w/plastic cover) Operating Temperature Rating: 40F (40C) to 185F (85C) Storage Temperature Rating: 40F (40C) to 260F (125C) Materials: Black UL-Rated thermoplastic body (thermoset for Type II body & buttons). Cover is grey thermoplastic or steel-Type l gold, Type ll silver Marking: Custom marking available. Consult factory for options Termination: 10-32 thread and quick-connect options available Torque Rating: 24 in-lbs (2.7N m) max Mounting Torque Rating: Plastic cover - 15 in-lbs (1.7N m) Metal cover - 30 in-lbs (3.4N m) Ingress Protection Rating: IP66 On plastic cover version only (except for terminals) Compliances: SAE J553 SAE J1171 (ignition protected) EATON Commercial vehicle solutions 99Ordering information 12X X XX - X X X - XX - XX Series Terminal Rating Bracket Mtg. Holes Cover* Options Hardware 121 = Type I, 12 VDC A = Two 10-32 studs .66 (Aux), .56 (Bat) 05 = 5 amps 0 = No bracket 0 = No bracket M = Metal 01 = Waterproof (metal WA = Whiz-lock nut 122 = Type II, 12 VDC B = Two 10-32 studs .56 (Aux & Bat) 08 = 8 amps A = Bracket 1 = .140 dia. P = Plastic covers only) assembled 123 = Type III, 24 VDC C = Two 10-32 studs .66 (Aux & Bat) 10 = 10 amps B = Bracket 2 = .196 dia. WB = Whiz-lock nut bulk 124 = Type I, 24 VDC D = Two .250 QC (Aux & Bat)*** 12 = 12 amps C = Bracket 3 = .237 dia. (metal only) 02 = Splash proof HA = Nut & lock washer 125 = Type II, 24 VDC H = One 10-32 stud .56 (Bat), 15 = 15 amps E = Bracket 4 = .265 dia. (plastic only) (optional on metal assembled Double .250 QC Aux)** 20 = 20 amps (plastic only) 5 = .228 dia. (plastic only) covers - add 02 sufx HB = Nut & lock washer bulk L = Two 10-32 studs .37 (Aux & Bat) 25 = 25 amps 6 = .221 dia. (metal only) std. on plastic covers - KA = Keps lock nut assembled 30 = 30 amps omit 02 sufx.) KB = Keps lock nut bulk 35 = 35 amps 40 = 40 amps 50 = 50 amps *Series 123 available in plastic cover only. Series 122 & 125 available in metal cover only. **40A maximum ***30A maximum Please consult factory regarding conguration availability. Temperature Derating / Time Current Curves Temperature Derating Curves 200 150 10 amps & below typical curve 15 amps & above 100 typical curve 50 0 0 50 100 150 200 250 300 Ambient Temp. o (in C) Trip Time vs. % Rated Current 1000 100 10 amps & below typical curve 10 15 amps & above typical curve 1 0.1 100 200 300 400 500 600 % of Rated Current EATON Commercial vehicle solutions 101 Maximum % Hold Current