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Battery Disconnect Switches, Electrical Disconnect Switches, and More

Disconnect switches have several important jobs in commecrial vehicles and equipment. Battery disconnect switches cut-off electrical power, help protect against electrical fires and theft when equipment is not in use, provide a reliable shutdown of power during maintenance, and protect batteries from excessive drain.

Commercial vehicle electrical systems are very demanding of batteries. Excessive drain happens even when the ignition switch is in the off position. Master disconnect switches are designed to power down the vehicle completely, protecting against parasitic battery drain. Cutting off the battery with a master battery disconnect switch removes all parasitic loads and small leakage currents that kill a battery over time. Disconnect switches also prevent injury of the technicians repairing electrical systems by disconnecting all power.

Current drain also happens when the ignition is on, and the vehicle or equipment is idling, like in police cars, ambulances, trucks and delivery fleets. In this case, you can't disconnect the main power, because you still need the electrical system to run. Low voltage disconnect switches are an ideal option. They monitor the battery loads and automatically disconnect only non-critical loads from batteries to prevent excessive discharge.
1 - 12 of 41
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Description
Price
Quantity
  • Sealed master disconnect switch
  • Key operated
  • SPST (on-off) for battery circuit only
  • Does not disconnect alternator of generator
  • 3/8" stud terminals
  • Rated 180 amps for 6-36 volts DC
  • 1,000 amp in-rush rating
  • Once piece die-cast housing is 2 5/8" diameter and 4 3/8" long
  • Mounting stem is 3/4" diameter and 1/2" long
  • Lever operated disconnect switches 44030 and 44031 also available
Item#:
44029
Manufacturer Item:
51-916
Manufacturer:
POLLAK
Avail #:
43.00
1+
21.2700
10+
18.0700
50+
15.9500
EACH
  • Sealed master disconnect switch
  • Lever operated
  • SPST (on-off) for battery circuit only
  • Does not disconnect alternator of generator
  • 3/8" stud terminals
  • Rated 180 amps for 6-36 volts DC
  • 1,000 amp in-rush rating
  • Once piece die-cast housing is 2 5/8" diameter and 4 3/8" long
  • Mounting stem is 3/4" diameter and 1/2" long
  • Key operated disconnect switch 44029 also available
Item#:
44030
Manufacturer Item:
51-902
Manufacturer:
POLLAK
Avail #:
716.00
1+
23.8400
10+
20.2600
50+
17.8800
EACH
  • Sealed master disconnect switch
  • Lever operated
  • DPST (on-off) for battery alternator or generator circuit
  • Breaks alternator circuit (max of 20 amps) prior to disconnecting battery
  • 3/8" and #10-32 stud terminals
  • Rated 180 amps for 6-36 volts DC
  • 1,000 amp in-rush rating
  • Once piece die-cast housing is 2 5/8" diameter and 4 3/8" long
  • Mounting stem is 3/4" diameter and 1/2" long
  • Key operated disconnect switch 44029 also available
Item#:
44031
Manufacturer Item:
51-904
Manufacturer:
POLLAK
Avail #:
145.00
1+
22.8400
10+
19.4100
50+
17.1300
EACH
  • Face plate for lever operated master disconnect switches with on-off designation 44030, 44031
  • Polished aluminum with black letters
Item#:
44032
Manufacturer Item:
51-303
Manufacturer:
POLLAK
Avail #:
229.00
1+
1.0600
10+
0.9010
50+
0.7950
EACH
  • Battery disconnect switch
  • Bussmann 15250-1BLR
  • Non-fused current interrupt disconnect
  • Opens circuit between a battery and the complete electrical load
  • Max surge 2,000 amps on 20% duty, with 5 seconds on time
  • 1/2" brass, tin plated stud
  • 8" wide, 4.19" high
  • 302°F temp rating
  • 400 amps at 50 volts
  • Recommended mounting on negative battery post
Item#:
44033
Manufacturer Item:
15250-1BLR
Manufacturer:
COOPER BUSSMANN EATON
Avail #:
8.00
1+
191.3800
10+
172.2400
50+
162.6700
EACH
  • Face plate for key operated disconnect switch 44029
  • Clearly shows on-off designation
  • Includes alignment hole
  • Polished aluminum with black letters
Item#:
44034
Manufacturer Item:
51-322
Manufacturer:
POLLAK
Avail #:
6.00
1+
1.2200
10+
1.0300
50+
0.9150
EACH
  • Heavy duty rotary lever disconnect switch
  • DPDT spring returns to Off from both On positions
  • Allows forward/reverse motion of a motor without the need for a relay, especially for operation of tarps on trucks
  • Heavy Duty component parts: 3/32" thick terminals, silver-laminated contacts to resist arcing over a long working life
  • 2.09" diameter (53.1mm) steel case
  • 10-32 x .375" (9.5mm) terminal screws with lockwasher
  • Mounting stem 1/2"-20 thread
  • On-off-on, both on positions spring return to off position
  • 50A
Item#:
44035
Manufacturer Item:
75712-04
Manufacturer:
COLE HERSEE
Avail #:
18.00
1+
31.2100
10+
29.6400
50+
27.7700
EACH
  • Emergency stop disconnect switch
  • Heavy duty strike off switch
  • Twist to connect, push to disconnect
  • -13°F (-25°C) to 185°F (85°)C temp rating
  • 250A at 24V
Item#:
44037
Avail #:
91.00
1+
49.3100
10+
44.3700
50+
41.9100
EACH
  • Battery selector and master battery disconnect switch
  • Allows use of the first, second or both batteries simultaneously
  • Provides back-up starting power in an emergency
  • Gives a reliable shutdown of power during maintenance
  • Helps protect against electrical fires, when the vehicle is not in use
  • Minimizes battery drain
  • 500 amp intermittent duty rating
  • 310 amp continuous duty rating
  • 6-36 volts
  • UL and CSA M-750 rated
Item#:
44043
Manufacturer Item:
M-750
Manufacturer:
COLE HERSEE
Avail #:
10.00
1+
39.9300
10+
35.9300
50+
33.9400
EACH
  • Stem is 1 1/16" long
  • 8" 14 gauge wire leads
  • PVC coating protects from dust and weather
  • Normally open switch
  • Rated 25 amps at 6 volts
  • 15 amps at 12 volts
Item#:
44046
Manufacturer Item:
52-613
Manufacturer:
POLLAK
Avail #:
0.00
1+
12.0400
10+
10.2300
50+
9.0300
EACH
  • Single pole master battery disconnect switch
  • Isolate high current DC circuits from battery sources
  • Stainless steel hardware and tin-plated copper studs
  • Ignition protection to SAE j1171 and ISO 8846 for installation in a battery box of on vehicles carrying hazardous loads
  • Internal components protected from harsh weather environments: IP67 & IP6K9K rated
  • Panel mount
  • 300 amps
  • 32 volts
  • -58°F (-50°C) to 221°F (105°C)
  • Terminal stud size 3/8"-16x7/8" long
Item#:
44056
Manufacturer Item:
880062
Manufacturer:
LITTELFUSE TERRA POWER SYSTEMS
Avail #:
131.00
1+
28.0900
10+
23.8700
50+
21.0600
EACH
  • Dual pole master battery disconnect switch ideal for cutting electrical system from the battery
  • Also used for applications needing switching of two circuits or switching both positive and negative
  • Switch two vehicle voltage circuits simultaneously (24V and 12V)
  • Direct lockout/tagout capability in the on or off position (padlock or hasp)
  • With an ingress protection to IP67 and IP69K, the master disconnect switch can mount in exposed locations on the vehicle
  • Drop-in replacement to existing competitive master disconnect switch
  • Ignition protected to SAE J1171 and ISO 8846 for installation in a battery box or on vehicles carrying hazardous loads
  • Turning the know/key to the right 90° will turn ON the switch, turning the knob/key to the left 90° will turn OFF the switch. Turning the knowb will simultaneously turn on or off both poles of the switch
  • High power connections are made via ring terminals or eyelets on cables to the device's terminal studs. Markings are adjacent to terminal studs for circuit 1, 2, 3, 4
  • M12 terminal studs, mating nut hardware included
  • Rated 500 amps, 48 volts
Item#:
44057
Manufacturer Item:
880175 TR SERIES
Manufacturer:
LITTELFUSE TERRA POWER SYSTEMS
Avail #:
65.00
1+
75.6800
10+
64.3200
50+
56.7600
EACH
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