Victron Energy Battery Switch ON/OFF 275A

1. Introduction

The Battery Switch ON/OFF 275A is designed for battery systems up to 48V. It features an ergonomic and aesthetic knob design, which is removable for isolation or safety purposes. The switch can be mounted on a surface or panel, offering installation flexibility. It meets the ISO8846 Ignition Protection standard, making it suitable for use in engine rooms.

1.1. Features

• Interchangeable label stickers
• Glass fibre reinforced nylon enclosure
• Removable cable access window on all 4 sides
• Removable ergonomic knob

Battery switch features

1.2. System examples

Example 1: Battery Switch used to disconnect the house system from the house battery. Use for preserving battery charge, system maintenance, or in an emergency.

Example 2: Battery Switch used to disconnect an inverter from the house battery. Use for preserving battery charge, system maintenance, or in an emergency.

Example 3: Battery Switch used to disconnect the alternator from the starter battery. Use for preserving battery charge, system maintenance, or in an emergency.

Example 4: Battery Switch used to parallel connect the house battery to the starter battery. Use in case of an emergency, such as a flat starter battery or a flat house battery.

Legend for System Examples:

2. Installation

2.1. What's in the box

The Battery Switch package includes:

• Battery Switch
• Instruction booklet with mounting template
• Interchangeable label sticker sheet
• 4 mounting screws

2.2. Mounting

The Battery Switch can be mounted in two ways:

1. Surface mount
2. Rear panel mount

Mounting Template Information: The battery switch packaging includes a full-size cutout template. Use this to mark screw holes and, for rear panel mounting, the hole for the knob. Refer to the 'Enclosure dimensions' chapter for detailed dimensions.

Mounting Holes:

• Screw holes: 4 holes, one on each corner.
• Mounting hole for rear panel mounting.

Mounting hole template. Not to scale, use the cutout from the Battery Switch packaging.

2.3. Label sticker

The Battery Switch comes with a sticker sheet containing 16 different label stickers. Select the sticker that best matches the circuit the Battery Switch will be used in. Remove the sticker from the sheet and place it on the knob of the Battery Switch.

Affixing label sticker

2.4. Wiring

Follow these steps to wire the Battery Switch into the electrical system:

• Disconnect the positive battery terminal.
• Mount the Battery Switch on the desired surface (surface mount) or panel (rear panel mount).
• Remove the appropriate side-plate for cable access. Ensure the side-plate facing upward is not removed to prevent water ingress.
• Use 120mm² (4/0 AWG) cables on all terminals to meet the Battery Switch current rating.
• Connect one terminal to the positive battery cable. Connect the other terminal to the positive cable of an alternator, load circuit, or second battery, depending on the installation type.
• Ensure all nuts and lock washers are properly attached. Tighten the nut to a recommended torque of 8Nm (maximum 12.5Nm).
• Reconnect the positive battery terminal.

3. Operation

To turn the switch ON: Twist the knob clockwise.

To turn the switch OFF: Turn the knob counter-clockwise.

To turn the switch OFF and remove the knob: Turn the knob a further 30° counter-clockwise.

The three switch positions: ON, OFF and Remove

3.1. Battery Switch knob removal

The knob can be removed to prevent accidental switching, for example, during system maintenance (safety) or when the system is left unattended for extended periods (battery discharge prevention). When the knob is removed, the switch is in the OFF position.

To remove the knob:

1. Ensure that engines and equipment connected to the same DC circuit as the Battery Switch are turned off.
2. Turn the Battery Switch knob counter-clockwise to the "OFF" position.
3. Turn the knob an additional 30° counter-clockwise until the "Remove" position is reached.
4. Pull the knob away from the Battery Switch.

Removal of the Battery Switch knob.

4. Technical specifications

* The battery switch is suitable to switch under load. However, if alternators, motors, or sensitive DC loads are connected, switch these off before switching the DC supply off.

4.1. Enclosure dimensions

Dimension drawing VBS127010010 - Battery switch ON/OFF 275A. All measures in mm.