CMA35H-DC12V-A-R-ZZ SPST-NO Maxi ISO 70A Relay, 4-Pin Compatible with 12V Cooling Fan, A/C, Battery Disconnect, Power Distribution, Winch & Lighting

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• Specs & Type (verified) — 12V coil, 70A resistive @14V, SPST-NO (1 Form A), plug-in Maxi ISO footprint, approx. 26×26×24.8 mm, −40~+125 °C; DIN/ISO terminals 85/86 (coil), 30 (feed), 87 (load). Interchange by type only: 4-pin Maxi ISO 70A NO relay; confirm socket, pinout and rating before replacement.
• Install & Wiring (DIN/ISO terminals) — Drops into Maxi ISO relay bases in the engine-bay power distribution center; follow DIN 72552 numbering: 85/86=coil, 30=common feed, 87=load (NO). The built-in resistor on “-R” helps damp coil flyback for ECUs and sensitive circuits. Always de-energize, match socket orientation, confirm blade size, and test coil polarity when a resistor is present.
• Compatibility by system (12 V loads using 70 A Maxi ISO) — Compatible with 12 V passenger cars, trucks, SUVs, UTVs, RVs, marine and off-road systems that specify a 4-pin Maxi ISO SPST-NO 70 A relay in the power distribution center: cooling-fan control, A/C condenser fan, battery disconnect/isolators, high-current lighting, winch/aux pumps, hazard/ignition feed, and other heavy DC loads. Verify socket footprint (Maxi ISO wide-foot), amperage, and NO configuration before replacement.
• What faults this helps solve — Compatible with symptoms caused by a failed 70 A Maxi ISO NO relay: cooling fan not engaging or only intermittently, A/C weak at idle due to fan not commanded, battery disconnect not actuating, high-current auxiliary accessories inoperative under load. A like-for-like Maxi ISO NO swap restores switching capacity and reduces heat at full load.
• Build for high-load environments — Heavy-duty silver-alloy contacts rated for 70 A, fast operate/release (≈10 ms/7 ms typical), high insulation resistance, and endurance tested to 100k cycles at rated load; designed for engine-bay temperatures and DC systems. Use proper gauge wiring and upstream MAXI fuse sized to your circuit.
• Complementary items for a clean install (how they work together) — Compatible with Maxi ISO relay sockets/holders and interlocking bases for 70 A relays; pair with a MAXI fuse holder/70 A fuse on the supply side to protect the harness; use crimp terminals sized for 6.3 mm blades and appropriate AWG for current. These accessories simplify mounting, service loops, and thermal management on high-draw fans and winches. (Examples: interlocking 70 A relay socket kits; MAXI-fuse relay kits).
• Fit-check note (accuracy first) — This is a general-purpose Maxi ISO 70 A, 4-pin, NO relay. Vehicle-specific OE numbers vary by make/trim; confirm your old relay’s footprint (Maxi ISO vs Micro ISO), pin layout (4-pin NO vs 5-pin CO), and dimensions (≈26×26×24.8 mm) before purchase. If your original uses a different footprint (e.g., Micro ISO 35 A), select the correct family instead.

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