RELIABILITY: Built with tin-plated copper studs and a glass-fiber reinforced nylon enclosure, this switch meets or exceeds ISO8846 and SAE J1171 ignition protection standards for safe engine room installation.

Key Features

• ✔ Removable Knob: For isolation, security, and maintenance lockout.
• ✔ Multi-Mount Design: Surface or rear panel mounting options.
• ✔ Cable Access: 4 removable side plates for easy wiring from any direction.
• ✔ Ignition Protected: Safe for use in petrol engine compartments.

Technical Specs

Continuous Rating:	275 Amps DC
Intermittent (5 min):	455 Amps DC
Cranking (10 sec):	1250 Amps DC
Max Voltage:	48V - 60V DC
Terminal Studs:	M10 (3/8") Tin-Plated Copper
Dimensions:	69 x 69 x 73 mm

System Type	Application	Notes
Solar Off-Grid	Battery to Inverter Isolation	Compatible with 12V, 24V, 48V LiFePO4 / Lead Acid
Marine / Boat	Main Battery Disconnect	ISO8846 Ignition Protected for Gas Engine rooms
RV / Camper	House Battery Master Switch	Prevents parasitic drain during storage

Standard installation involves mounting the switch on the positive (+) cable between the battery and the distribution bus or inverter. Ensure terminal nuts are tightened to approximately 8Nm (max 12.5Nm). Recommended for use with up to 120mm² (4/0 AWG) cables to maintain full 275A continuous rating.

Is this switch suitable for 48V lithium systems?

Yes, the BS-275 is rated for systems up to 48V nominal (60V max), making it ideal for the latest LiFePO4 battery banks used in solar and high-end marine setups.

How do I know if it is compatible?

If your system requires a continuous current of 275A or less and operates within the 12V-48V range, this switch is compatible. Please check your inverter's maximum continuous draw to verify.

What is the benefit of the removable knob?

The knob can be turned to a specific 'Remove' position (30° past OFF), allowing you to physically take the key with you. This serves as a safety lockout during maintenance and a theft deterrent for vehicles.