What is a Battery Master Switch?

WHY IS A BATTERY MASTER SWITCH IMPORTANT?

In the event of an electrical fault it’s important that all power to the electrical system can be cut off so that cables and circuits do not remain live. This will enable you to control any overheating which could start a fire, allow repairs to be safely made on any blown fuse or damaged cabling and reset the tripped circuit breaker. A battery master switch or switches, capable of disconnecting the system – including the starter circuits – must be fitted in a readily accessible position, as close to the battery as possible.

WHERE SHOULD I POSITION AND INSTALL MY BATTERY MASTER SWITCH?

You must be able to get at the switch without having to move anything out of the way, or use tools or keys to reach it.
If you can’t see the battery master switch, you must mark its position very clearly so that emergency services or other crew members can easily locate it in the event of an emergency.

WHAT TYPE OF BATTERY MASTER SWITCH WILL I NEED?

The switch that you choose must be capable of carrying the maximum current of the system, including when the engine is started. If there are separate circuits connected to separate batteries, each of them must have a battery master switch. A combined switch can be used, for example in a two battery system, where one battery is used for starting the boat’s engine and the other is used for domestic services.

Electrical equipment, such as bilge pumps, security alarms, fire pumps and navigation equipment – some of which may have electronic memories – can bypass the master battery switch, as long as they’re protected separately by fuses or circuit breakers. This will enable them to carry on functioning safely but still disconnect in the event of a short circuit or overload fault.

KT has released a range of Battery Master Switches and Voltage Sensitive Relays, Now available.
Contact KT on 08 9358 7000 or email us for more information.

Model: KTBMS2W
KT 2 Way Battery Master Switch
2

  • Red ‘ Recharge’ Led Indicator Activates When Battery Drops To 12.3V
  • Green Led Power On Indicator
  • 300A Continuous Current At 12V, 1500A Intermittent
  • Removable Key
  • Suitable for Automotive & Marine Use
  • Silver coated contacts
  • Rubber sides to pierce cable entry
  • Mounting Hardware included
  • LED Power ‘ON’ indicator and unique ‘Recharge’ LED Indicator activates when the battery drops to 12.3V.

This function is designed to alert the user to a low power situation so that the accessory can be switched off before the primary battery is flat.

Model: KTBMS4W
KT 4 Way Battery Master Switch

2

  • Red ‘ Recharge’ Led Indicator Activates When Battery Drops To 12.3V
  • Green Led Power On Indicator
  • 300A Continuous Current At 12V, 1500A Intermittent
  • Removable Key
  • Suitable for Automotive & Marine Use
  • Silver coated contacts
  • Rubber sides to pierce cable entry
  • Mounting Hardware included

LED power on indicators for Battery Position 1, 2 and 1 + 2. This 4 Way Master Switch features a unique ‘Recharge’ LED Indicator that activates when the battery drops to 12.3V. This function is designed to alert the user to a low power situation so that the accessory can be switched off before the primary battery is flat.

For more information, please contact us using the below contact form or call us on 08 9358 7000

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