Distribution
Review how the BEP 701-MD Motorised Battery Switch connects, how it operates and which installation requirements apply to this model.
Open this example as a new project. Use your own parts and cable lengths to make the plan yours.
The motorized switch needs its battery-negative control lead and the prescribed remote/indicator wiring in addition to its two main studs. Size the switched power path from its actual loads and charging sources; 275 A is a contact rating, not operating current.
The motorized switch needs its battery-negative control lead and the prescribed remote/indicator wiring in addition to its two main studs. Size the switched power path from its actual loads and charging sources; 275 A is a contact rating, not operating current.
Wiring diagram
Open this example in Crimp to use your own parts and cable lengths. Review the assumptions and installation notes as you adapt the circuit.
Installation notes
Guidance for this model, with sources linked beside the relevant advice.
Verified against the manufacturer's documentation (rev. INST-701-MD-V4 plus BEP three-pin Deutsch wiring drawing; manufacturer-authored mirrors), checked 2026-10-01. Manufacturer documentation →
The original 701-MD switches a battery's main positive conductor and is rated 275 A continuous. Its 455 A intermittent and 1,250 A cranking figures do not have usable time windows in this source, so they are not continuous design limits. This record is the standard 701-MD, not the voltage-sensitive MDVS or other remote-control variants. Remote operation requires the manual knob in the Auto Off position. See ratings, PDF p. 2.
Connect battery positive to the stud marked INPUT and the protected load circuit to OUTPUT. Although the contact carries current in either direction, the powered actuator arrangement depends on correct input orientation. Both large studs are 10 mm. Provide strain relief; the manual recommends 50 mm² cable and allows 70 mm² only as an absolute maximum with appropriate support. Choose the main fuse for the conductor and actual downstream duty, not automatically at 275 A.
The Deutsch drawing identifies pin 1 red as the LED output, pin 2 green as the switch command, and pin 3 black as control negative. The remote switch grounds the green command; the red lead drives the indicator shown. Take the black negative from the same battery that this switch isolates, with only one negative supply to each unit. Mixing banks here can cause erratic operation. See rear view and remote wiring, PDF p. 1.
First check that manual On and Off operate the main circuit. In Auto Off, exercise the remote switch and compare the indicator with continuity or load voltage. Automatic operation needs 8–30 V; a rapid status indication can point to supply outside that range. Off-state standby draw is documented as 15 mA, not zero, so include it when evaluating long storage. A manual override changes the contact state independently of the remote command. See operation and indications, PDF p. 3.
Build it out
Add 701-MD to your diagram, then connect your batteries, chargers and loads. Crimp calculates cable sizes and checks the connections as you draw.
Every cable you draw there is sized against ABYC E-11, from the same tables as the reference on this page.
Technical reference
Check the model, ratings and connection points against your own unit before choosing installation hardware.
Check stud sizes, fuse type, run length and how warm the space gets against the gear you actually have before you order.
Catalog connection points, current direction and planning limits. Check the manufacturer's pinout and connector ratings before installation.
BATTERY INPUT
in-pos
positive · bidi
LOAD OUTPUT
out-pos
positive · bidi
PIN 1 RED LED
led
signal · bidi
PIN 2 GREEN COMMAND
remote
signal · bidi
PIN 3 BLACK −
control-neg
negative · input
A dash means a current rating is not specified here.
Method & provenance
Manufacturer specifications describe the equipment. Crimp calculates cable results from the circuit and assumptions you enter.
From the maker
Manufacturer, model, ratings and which terminal does what come from the catalog. A newer revision, or the nameplate on the unit in your hand, can say something different — when it does, the nameplate wins.
ABYC E-11
Sized against ABYC E-11. Boats built to UK or EU rules answer to ISO 13297 — check these figures against it before you build. The run length and the current above are what drive the result. Crimp doesn't know how warm your space gets; draw the cable inside an engine-bay zone on the canvas and it sizes for the heat.
Next step
Open this example as a new project. Add your equipment and cable lengths, then review the sizing and checks for your setup.