Product Datasheet
75920 MASTER BATTERY DISCONNECT SWITCH SERIES
400 A • SPST • IP68 • Integrated lockout tag-out
Specifications
Operating Voltage:
Continuous Current:
6V min, 36V max
12V: 400A max
24V: 300A max
36V: 200A max
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
-40 to +85 °C
IP68
96 hours - salt spray test
to ASTM standard
SAE J1455
Threads: 3/4"-16
Max Torque: 18 ft-lbs (24.4 Nm)
12 in-lbs (1.35 Nm)
Intermittent Current:
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:
Ingress Protection:
Corrosion Test:
Vibration and Shock Test:
Mounting Stem:
Knob Retention Screw Torque:
Features/Benefits
• 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
BULK
75920
75920-05
75920-10
75921
75921-10
BOXED
75920-BX
75920-05-BX
75920-10-BX
–
–
RETAIL
75920-BP
–
–
–
–
SWITCH POSITION
SYMBOLS
"On" - "Off"
“I” - “O”
“On” - “Off”
"I" - "O"
“I” - “O”
BATTERY TERMINAL
THREADS
3/8-24"
3/8-24"
TORQUE
70-90in-lbs (8-10 Nm)
70-90in-lbs (8-10 Nm)
70-90in-lbs (8-10 Nm)
70-90in-lbs (8-10 Nm)
70-90in-lbs (8-10 Nm)
MATERIAL
Brass Hex Nut
Brass Hex Nut
Stainless Steel Hex Nut
Brass Hex Nut
Stainless Steel Hex Nut
3/8-24"
M10x1.5
M10x1.5
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.
Datasheet Replaces Hotfeed Number D-618
littelfuse.com
1 of 2
© 2016 Littelfuse Commercial Vehicle Products
Rev: 120116
Product Datasheet
75920 MASTER BATTERY DISCONNECT SWITCH SERIES
Dimensions in inches (millimeters)
75920
1.69 [42.9]
Ø2.72 [Ø69.1]
Ø0.326 [Ø8.28]
Ø2.75 [Ø69.9]
2.59 [65.8]
0.450 [11.43]
0.900 [22.86]
0.200 [5.08]
0.47 [11.9]
2.28 [58.0]
0.250 [6.35]
0.750 [19.05]
1.375 [34.93]
MOUNTING
PATTERNS
Ø0.812 [Ø20.62]
Ø0.312 [Ø7.92]
0.670
[17.02]
0.812 [20.62]
0.813 [20.64]
1.000 [25.40]
MOUNTING STEM, 3/4-16
0.670 [17.02]
Ø0.312 [Ø7.92]
Ø0.812 [Ø20.62]
75921
Datasheet Replaces Hotfeed Number D-618
littelfuse.com
2 of 2
© 2016 Littelfuse Commercial Vehicle Products
Rev: 120116
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