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Blue Sea Systems

Blue Sea 4155 DPDT Center-Off Switch connections

Review the Blue Sea 4155 DPDT Center-Off Switch connections, setup and installation requirements. This overview does not calculate cable or protection sizes.

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Compatible systems
12 V / 24 V

Connection overview

DPDT ON–OFF–ON connections.

See how this component fits into a system. Use the manufacturer’s installation instructions for the complete connections.

Blue Sea 4155 DPDT Center-Off Switch connection overview with 5 components: AGM 100, ATC inline fuse holder, DPDT ON–OFF–ON, Load A · 1A, Load B · 2A. 7 cable connections. Crossings are not junctions.AGM 100 + to ATC inline fuse holder IN. ATC inline fuse holder OUT to DPDT ON–OFF–ON COM 1. DPDT ON–OFF–ON A 1 to Load A · 1A +. Load A · 1A − to DPDT ON–OFF–ON A 2. DPDT ON–OFF–ON B 1 to Load B · 2A +. Load B · 2A − to DPDT ON–OFF–ON B 2. DPDT ON–OFF–ON COM 2 to AGM 100 −AGM 100 + to ATC inline fuse holder INATC inline fuse holder OUT to DPDT ON–OFF–ON COM 1DPDT ON–OFF–ON A 1 to Load A · 1A +Load A · 1A − to DPDT ON–OFF–ON A 2DPDT ON–OFF–ON B 1 to Load B · 2A +Load B · 2A − to DPDT ON–OFF–ON B 2DPDT ON–OFF–ON COM 2 to AGM 100 −100 Ah AGM. Connection overview only. Cable lengths are placeholders; use the complete manufacturer diagram to select conductors and protection. No automatic fuse or cable-size recommendation is supplied by this example.AGM 100++−−ATC inline fuse holder. Illustrative inline holder, 0.1 m from battery. Verify the installed holder, fuse voltage and interrupt rating. Connection overview only. Cable lengths are placeholders; use the complete manufacturer diagram to select conductors and protection. No automatic fuse or cable-size recommendation is supplied by this example.ATC inline fuse holderINOUTBlue Sea 4155 DPDT Center-Off Switch. Select each contact position to inspect its circuit. An open or unselected branch is not evidence that its cable needs no protection. Momentary spring return is not timed. Connection overview only. Cable lengths are placeholders; use the complete manufacturer diagram to select conductors and protection. No automatic fuse or cable-size recommendation is supplied by this example.DPDT ON–OFF–ONCOM 1COM 1COM 2COM 2A 1A 1A 2B 1B 2B 2Example load 1A. Connection overview only. Cable lengths are placeholders; use the complete manufacturer diagram to select conductors and protection. No automatic fuse or cable-size recommendation is supplied by this example.Load A · 1A+−Example load 2A. Connection overview only. Cable lengths are placeholders; use the complete manufacturer diagram to select conductors and protection. No automatic fuse or cable-size recommendation is supplied by this example.Load B · 2A+−
Blue Sea 4155 DPDT Center-Off Switch connection overview with 5 components: AGM 100, ATC inline fuse holder, DPDT ON–OFF–ON, Load A · 1A, Load B · 2A. 7 cable connections. Crossings are not junctions.Two independent changeover poles. Keep the two common contacts electrically separate and verify both selected paths, their returns and protection; the contact rating is not load current. Connection overview only. Cable lengths are placeholders; use the complete manufacturer diagram to select conductors and protection. No automatic fuse or cable-size recommendation is supplied by this example.
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Technical reference

Specifications and terminal map.

Check the model, ratings and connection points against your own unit before choosing installation hardware.

Catalog specification

Two separate changeover poles operated together. Each common connects to its A or B contact; center off opens both poles. Blue Sea 4155 is rated 5 A / 30 V DC. No internal link joins the poles.

Compatible systems
12 V / 24 V

Terminal map

Catalog connection points, current direction and planning limits. Check the manufacturer's pinout and connector ratings before installation.

COM 1

neutral · bidi

5 A

COM 2

neutral · bidi

5 A

A 1

neutral · bidi

5 A

A 2

neutral · bidi

5 A

B 1

neutral · bidi

5 A

B 2

neutral · bidi

5 A
Sources and sizing method

Equipment specifications. Model details, ratings and terminal roles come from the catalog. Check your unit’s label and current manufacturer documentation for its exact revision.

Connection overview. This diagram explains the connection arrangement; it does not calculate cable sizes or protection for the installation. Follow the manufacturer’s complete wiring and protection instructions.

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