© 2023 Littelfuse Commercial Vehicle Products
Rev: 122023-A
littelfuse.com
Product Datasheet
SR SERIES MASTER DISCONNECT SWITCHES
300A • Isolates High-Current DC Circuits From Battery Sources
Features and Benefits
• Isolates the batteries and eliminates battery drain
when vehicle is stored overnight or for longer periods.
Electrically cuts off battery power for safety or when the
vehicle is being serviced.
• Ignition protected to SAE J1171 and ISO 8846 for
installation in a battery box or on vehicles carrying
hazardous loads.
• Available with integral holes to accept lockout/tagout. No
need to purchase additional hardware.
• Plastic construction will not corrode and stands up to
roadsplash and salt spray. Ingress protected to IP67/
IP69K. Switch can be mounted anywhere on the vehicle.
• Units have a depth of only 3” (knob front to end of studs)
– can be installed in locations where behind-panel space
is limited.
• Stainless steel hardware and tin-plated copper contacts
minimize resistance in harsh environments.
Specifications
Datasheet Replaces Hotfeed Number D-659
Description
Stainless steel hardware and tin-plated copper studs. Can be
installed in locations with limited space behind the panel.
Specifications Overview
Max Operating Voltage: 48V, 32V DC & 12V DC
Single Cycle: 48V DC
Max Continuous Current: 5A-600A
Inrush Rating (2 sec): 3,500A
Terminal Stud Size: 3/8”-16 (accepts M10 terminals)
Ingress Protection: IP67/IP69K
Ignition Protection: Meets ISO 8846 & SAE J1171
Web Resources
Download technical resources at:
littelfuse.com/SR
Ordering Information
BULK
PART NUMBER
BLISTER
PART NUMBER
POLE MOUNT
MAX VOLTAGE
RATING
MAX TOTAL
CONTINUOUS CURRENT
TERMINALS
880062 880062-BP SPST Flange Mount 48V DC 300A Two Tin Plated Copper Studs
880064 — SPST Panel Mount 48V DC 300A Two Tin Plated Copper Studs
880154 — SPST Panel Mount 32V DC 600A Two Tin Plated Copper Studs
888842000A — SPDT Panel Mount 12V DC 5A Molex 33472-0406 MX150
888842001A — SPDT Panel Mount 12V DC 5A
Molex 33472-0406 MX150;
Molex 33471-0306 MX150
PN 880064
PN 880062
Common
Battery
Starter
or other
DC loads
Battery
Master Battery Disconnect
(shown in ON state)