Micro ISO 280 12V Relay – SPST 20A – R1 Suppressed (303-1AH-C-R1-U01)This aftermarket relay matches the ISO 280 micro footprint and electrical behavior specified for OE 4016819 / 4011283. It uses a single-pole normally-open contact rated 20A @ 14V and an R1 (resistor) coil for reduced electromagnetic interference.
Voltage / Type: 12VDC, SPST (1 Form A), 4-pin micro ISO 280
Rating: 20A resistive @ 14V (automotive duty)
Coil suppression: R1 parallel resistor (non-polarized coil)
Enclosure: Flux-tight; compact high-temperature design
Terminals: #30 (common), #87 (NO output), #85/#86 (coil)
Form factor: 2.8 mm blade terminals; panel / fuse-box mount
Cross reference: Compatible with HFV11/12-HS-R(257)
Restores control of circuits commonly assigned to this cavity on compatible machines: radiator cooling fan, fuel pump, horn, and lighting. A healthy relay helps the fan engage at temperature and prevents intermittent no-start or overheating tied to relay contacts.
Compatible with Polaris RZR: 570 (2012–2019); 800 (2010–2014); 900 (2011–2019); 1000 (2014–2019); XP Turbo (2015–2020)
Compatible with Polaris Ranger: Crew 500/570/800 (2010–2020); 1000 & Crew 1000 (2015–2020); XP 1000 (2017–2020)
Compatible with Polaris General: 1000 / 4 1000 (2016–2020)
Compatible with Polaris Sportsman: 450/550/570 (2011–2020); 850/1000 / XP 1000 (2011–2020)
Compatible with Polaris ACE: selected models (2017–2018) where OE 4016819/4011283 is specified
Located in the vehicle's fuse/relay box; pull old relay straight up, align blades, and press the new relay fully into the cavity
R1 (resistor) coil is not polarity-sensitive; if your machine uses a diode-suppressed relay in another cavity, observe diode polarity
After installation, verify fan operation and that the engine reaches/holds normal temperature
Replaces OE: 4016819, 4011283 (verify by parts diagram/label on your original relay)
Cross reference: HFV11/12-HS-R(257) (spec-equivalent micro ISO 280 relay)
Radiator fan assemblies commonly paired during repairs (model-specific): 2412447, 2410366, 2410901, 2410288, 2204192
Note: This is an aftermarket replacement compatible with the OE numbers shown. It is not manufactured by or affiliated with any OEM. Always match the OE number and the cavity style before purchase.