This 12V relay is suitable for a wide range of Volvo Penta marine engines. A faulty relay can cause starting problems or electrical components not functioning correctly. Replacing a defective relay ensures reliable operation of the engine’s electrical system. Replaces Volvo Penta OEM Number 21400091 Compatible Volvo Penta Engines Suitable for many Volvo Penta engines including: D1 Series D1-13 D1-13B D1-13F D1-20 D1-20B D1-20F D1-30 D1-30B D1-30F D2 Series D2-40 D2-40B D2-40F D2-50F D2-55 D2-55B D2-55C D2-55D D2-55E D2-55F D2-60F D2-75 D2-75B D2-75C D2-75F D3 Series D3-110 D3-140 D3-150 D3-170 D3-200 D3-220 D4 Series D4-150 D4-175 D4-180 D4-210 D4-225 D4-260 D4-270 D4-300 D4-320 D6 Series D6-280 D6-300 D6-310 D6-330 D6-340 D6-370 D6-380 D6-400 D6-435 D6-440 D6-480 Larger Volvo Penta Engines D8 series D9 series D11 series D13 series D16 series Also suitable for various Volvo Penta V-series petrol engines and marine propulsion systems.