Commercial Vehicle Product Datasheet 75920 MASTER BATTERY DISCONNECT SWITCH SERIES 400 A • SPST • IP68 • Integrated lockout tag-out Specifications Operating Voltage: 6V min, 36V max Continuous Current: 12V: 400A max 24V: 300A max 36V: 200A max Intermittent Current: 12V: 1000A 90 sec on, 5 min off 12V: 1500A 60 sec on, 5 min off 12V: 2000A 30 sec on, 5 min off 12V: 3000A 15 sec on, 5 min off Description The 75920 Master Battery Disconnect switch is designed to protect service personnel and your vehicle systems. The switch protects vehicles from both battery drain and theft as well as allowing service personnel to lock-out tag-out. It also serves as an effective emergency power cutoff. Operating Temp: -40 to +85 °C Ingress Protection: IP68 Corrosion Test: 96 hours - salt spray test to ASTM standard Vibration and Shock Test: SAE J1455 Features/Benefits Mounting Stem: Threads: 3/4"-16 Max Torque: 18 ft-lbs (24.4 Nm) Knob Retention Screw Torque: 12 in-lbs (1.35 Nm) • High amperage capacity: 400A at 12V DC • Can be used in high side or low side applications • Waterproof and dustproof to IP68 - switch can be mounted in exposed locations • Composite engineered polymer housing will not rust or corrode. Tested per SAE 1455 for salt, calcium chloride and magnesium chloride • Large red knob is easy to operate with gloves • 90° switch travel makes it easy to identify the switch position • Large divider on base prevents accidental shorting of high energy cables • Fits standard Master Disconnect mounting pattern Applications • • • • Heavy Truck Off-Road Emergency Vehicles Material Handling • • • • Mining Agricultural Marine Construction Web Resources Download installation instructions, 2D prints and technical resources at: littelfuse.com/75920 Ordering Information PART NUMBERS BATTERY TERMINAL BULK INDIVIDUALLY BOXED RETAIL CLAMSHELL SWITCH POSITION SYMBOLS THREADS TORQUE MATERIAL 75920 75920-BX 75920-BP "On" - "Off" 3/8-24" 70-90in-lbs (8-10 Nm) Brass Hex Nut 75920-05 75920-05-BX – “I” - “O” 3/8-24" 70-90in-lbs (8-10 Nm) Brass Hex Nut 75920-10 75920-10-BX – “On” - “Off” 3/8-24" 70-90in-lbs (8-10 Nm) Stainless Steel Hex Nut 75921 – – "I" - "O" M10x1.5 70-90in-lbs (8-10 Nm) Brass Hex Nut 75921-10 – – “I” - “O” M10x1.5 70-90in-lbs (8-10 Nm) Stainless Steel Hex Nut Need a custom version? This product can be made available with a custom knob and bezel design. Please contact your sales rep to discuss lead time and minimum order requirements. littelfuse.com 1 of 2 © 2016 Littelfuse Commercial Vehicle Products Rev: 053116 Commercial Vehicle Product Datasheet 75920 MASTER BATTERY DISCONNECT SWITCH SERIES Dimensions in inches (millimeters) 75920 1.69 [42.9] Ø0.326 [Ø8.28] Ø2.72 [Ø69.1] Ø2.75 [Ø69.9] 2.59 [65.8] 0.450 [11.43] 0.200 [5.08] 0.900 [22.86] MOUNTING PATTERNS 0.670 [17.02] 0.47 [11.9] 1.375 [34.93] 2.28 [58.0] 0.250 [6.35] Ø0.812 [Ø20.62] 0.750 [19.05] Ø0.312 [Ø7.92] 0.812 [20.62] 0.813 [20.64] 1.000 [25.40] Ø0.812 [Ø20.62] MOUNTING STEM, 3/4-16 0.670 [17.02] Ø0.312 [Ø7.92] 75921 littelfuse.com 2 of 2 © 2016 Littelfuse Commercial Vehicle Products Rev: 053116