50214737 Front
50214737 Front

Modular Battery Protect Relay 12 V / 500 A

The DC Modular Battery Protect Relay has the same capabilities as the Remote Battery Switch. It is a smart high current magnetic latching contactor, that can handle continuous DC currents of up to 500 Amps.

Whereas the Remote Battery Switch is mainly used as a locally or externally controlled battery load switch, the Modular Battery Protect Relay has a number of additional features. Most importantly, it can protect your battery without the need for an external measurement and control device.


Rated voltage 12 V
Nominal current 500 A
Cranking current (1min.) 1000 A
Nominal make / break current 500 A (0..34 Vdc) / 350 A (35..60 Vdc)
Peak make / break current 1600 A (0..34 Vdc) / 1200 A (35..60 Vdc)
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  • Smart high current magnetic latching relay, draws virtually no current in On (Close) or Off (Open) state.
  • Silver alloy contacts and silver plated copper busbars, for maximum conductivity and high reliability when switching live loads
  • Local Open and Close buttons on top, to manually override the switch state
  • Automatic load disconnection (10 programmable disconnect- and reconnect volt- age levels)
  • Override mode allows temporary battery connection during under voltage condi- tions, in case of emergency or to facilitate the battery charging process
  • 5 wire interface cable for remote control by panel switch, battery monitor or BMS. Compatible with two wire or single wire On/Off control. Includes status wire for controlling indicator light or providing feedback to BMS
  • Stainless steel studs, washers and nuts for optimal corrosion resistance
  • Unique grid optimized footprint allows space saving arrangements with other DC Modular products
  • Special fiber reinforced plastic housing offers excellent high temperature proper- ties, good chemical resistance and high strength
  • Robust transparent covers with breakouts to allow wire access from any direction
  • Smart terminal design allows dual mirrored cable lug connections

Product specifications

50214737 Modular Battery Protect Relay 12 V / 500 A
Weight (Kg) 0.8
Dimensions (mm) 150 x 50 x 94
Maximum voltage 60 Vdc
Nominal current @ 25°C 500 A (see Precaution #2)
Cranking current (1 minute) 1000 A
Nominal make / break current 500 A (0 .. 34 Vdc) 350 A (35 .. 60 Vdc)
Peak make / break current 1600 A (0 .. 34 Vdc) 1200 A (35 .. 60 Vdc)
Coil / supply voltage (+Vdc) 7 .. 17 Vdc
Coil / supply current (idle state) < 100 μA
Coil / supply current (state change) < 4 A
Control wire supply current < 3 mA (when active)
Remote control By control wires (length 40 cm, max. 15 m)
Local control On/Standby, Open and Close contact, Override mode
Automatic disconnect and reconnect Yes (10 individually programmable disconnect and reconnect voltage levels)
Indicators Contact open/close, Undervoltage disconnect, Override mode, Error and Setup
Protected against High temperature, High/Low supply voltage, Ignition (ISO 8846)
Mechanical life 100000 cycles
Electrical life 10000 cycles (@ 400 A / 24 V / resistive)
Operating temperature range -20 .. +60°C
Connection studs / DCM grid size M10 / 1 x 3
Protection class IP 65
Standards EMC: 2014/30/EU, Low voltage directive: 2014/35/EU, RoHS: 2011/65/EU, Automotive: EN 50498, ISO 8846