SFK-112DM 4PCS 12V DC 20A 250VAC PCB Power Relay, SPST-NO 4-Pin THT Board Mount Compatible with SFK-112DM-E, SFK-124DM, SFK-105DM; Match by Coil Voltage, Pin Layout, Part Number

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• SPECIFICATIONS & PART NO.: SFK-112DM (12VDC coil), SPST-NO 1 Form A, 20A @ 250VAC resistive load, coil power 0.9W, dielectric 4,500VAC (contact-to-coil), operate/release 20ms/10ms, through-hole 4-pin PCB; body approx. 27.6 x 15.7 x 23.3 mm. Compatible with part numbers SFK-112DM-E (25A), SFK-112DMP-F-H-E, SFK-124DM (24V), SFK-105DM (5V) - select by voltage, footprint, and pin layout
• INSTALL LOCATION & REPLACEMENT: Solder-mounted on control PCBs—typically in HVAC/air-conditioner compressor/fan boards, motor/pump modules, and appliance controllers. Disconnect power, discharge capacitors, match pinout (COM/NO), desolder the old relay, clean pads, install the new unit flush to the board, and reflow; verify coil receives 12VDC and that contact side is isolated from coil.
• FITMENT METHOD (NOT VEHICLE-YEAR SPECIFIC): Choose by the board’s printed part number (SFK-112DM) and by electrical/mechanical specs: 12VDC coil, 1a contact, 4-pin PCB footprint, and size. This is a PCB power relay, not a plug-in cube. For boards designed for 24V coils use SFK-124DM; for 5V coils use SFK-105DM. Always compare datasheet pin layout before purchase.
• TYPICAL SYMPTOMS RESOLVED: Compressor or fan not starting, chattering relay, intermittent cycling, welded/stuck contacts, visible heat discoloration around relay pads. Diagnosis tip: with power off, check for melted case or burned pads; with power on (qualified tech only), verify coil drive ~12VDC and that NO closes when energized; replace if out of spec.
• COMPLEMENTARY/ALTERNATE PART NOS. (MATCH BY SPECS ONLY): Compatible with part numbers such as G4A-1A-E (12V), 891WP-1A-C (12V), CMP6-S-DC12V, RF-SS-112DMF—used on similar 1 Form A 20A PCB positions. These are not plug-in automotive ISO relays; use for board repair. Pair with 60/40 solder, desoldering braid, flux, and heat-resistant tape for a clean swap

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