Songle Relay 12V 4pin JD1914

Description

Songle SLC-12VDC-SL-A 4-Pin Heavy-Duty Power Relay (DC 12V Variant) The Songle SLC-12VDC-SL-A is a highly robust, high-capacity miniature power relay configured primarily for PCB mounting. Utilizing a 4-pin arrangement, this SPST-NO (Single Pole Single Throw – Normally Open) relay relies on a 12V DC control coil to safely switch exceptionally heavy current pathways. It is widely recognized for its boxy, durable structural casing and its ubiquitous presence in high-power consumer appliances and automotive modules. Key Features Contact Configuration: SPST-NO (1 Form A: 1 Normally Open contact line). Coil Voltage: 12V DC (Direct Current), drawing low-voltage power to close the internal high-amperage contact joint. High Switching Capacity: Massive current capability for its size, confidently handling up to 30A at 250V AC or 30A at 30V DC. 4-Pin Layout: Comprises 2 pins dedicated to the triggering coil and 2 heavy-duty load pins dedicated to the Normally Open switch loop. Architecture: Typically sealed or flux-tight plastic enclosure designed to insulate the internal mechanics against harsh, dusty environments or moisture. Compatibility Guide The Songle SLC series bridges low-power electronic control boards directly into high-wattage mains equipment. 1. Compatible Trigger Inputs Because this model uses a 12V DC coil, it connects seamlessly into low-voltage driver systems: Microcontrollers & DIY Boards: Frequently driven via external power transistors, Darlington pairs, or optocouplers from platforms like Arduino, ESP32, and Raspberry Pi. Embedded Power Supplies: Operates smoothly within standard 12V DC domestic automation architectures and automotive sub-systems. Industrial Controller Cards: Directly compatible with 12V DC digital output lines on intermediate automation blocks. 2. Mounting and Integration Unlike the plug-in “ice-cube” or octal style relays that slide into rail sockets, the SLC series is optimized for structural permanence: PCB Through-Hole Soldering: Designed to be soldered directly onto printed circuit board traces. Given the high 30A current rating, the copper traces on the receiving PCB must be heavily widened or reinforced with solder pooling to handle the thermal load. Pre-made Relay Modules: Frequently found pre-soldered onto hobbyist and industrial breakout expansion boards equipped with onboard opto-isolation and screw terminal blocks for quick wire termination. 3. Common Applications High-Power Household Appliances: The primary switching component found inside modern air conditioners, storage water heaters, commercial microwave ovens, and electric space heaters. Automotive Power Accessories: Manages heavy direct-current accessories like high-draw radiator cooling fans, aftermarket audio amplifiers, and specialized vehicle lighting grids. Industrial Inrush Management: Functions as an intermittent bypass or main isolation switch for single-phase power supplies, pump motors, and high-wattage power arrays.