This is the Bueler BU5078 high current relay. A 12 volt, 120 amp SPST (single pole, single throw) relay.

120 amps is a serious amount of current. This is the relay for winches, auxiliary battery systems, cooling fans and motor circuits, where a standard 30 or 40 amp relay would run hot and eventually weld itself shut.

Specifications

• 12 volt DC
• 120 amp contacts
• SPST, single pole single throw
• Water resistant
• Standard top mounting, heavy duty bolt-on terminals
• Coil requires two 0.25 inch quick disconnects

Note this is SPST, so it switches a single circuit on and off rather than between two. For door locks and similar work you want an SPDT relay instead. See our full range of relays and relay harnesses.