Circuit Relays

Current Control for Circuits

Circuit Relays & Actuators

Protect your control panel's sensitive electronics and manage other components with genuine circuit relays from The Generator King. Acting as a protective isolation bridge, these electromechanical switches handle high current demands safely, preventing excessive amp draws from damaging your equipment.

Our warehouse stocks a wide range of genuine OEM relays and contactors to support field mechanics, control board builders, and maintenance engineers. All components are held locally and are ready for immediate counter pickup or fast delivery.

Get in touch with our sales team to get your quote today!

GET CIRCUIT RELAYS ON WHATSAPP

Struggling with a terminal pin layout or trying to match a specific control panel contactor?

Simply text us your requirements or upload a clear photo of your current relay casing, pin setup, or general board layout. Our team will quickly find the exact electrical match from our warehouse stock and send a competitive quote to you.

Switching Options

Our Range of Circuit Relays

12V Standard Relays
Reliable low voltage actuation modules designed for residential and light commercial starter loops.

24V Standard Relays
Industrial grade control panel relays built for standard medium to large diesel engine control frames.

12V / 10A Heavy-Duty Relays
Switching units configured to handle minor auxiliary currents smoothly.

12V / 40A High-Current Relays
High capacity automotive and stationary engine relays engineered for glow plugs and heavy solonoid loads.

24V / 40A High-Current Relays
Standard heavy industrial actuators tailored to manage rugged DC equipment feeds.

28V / 40A Extended-Voltage Relays
Specialised over-voltage tolerant switching units designed for specific charging alternator configurations.

230V AC / 10A Mains Relays
Robust alternating current interfaces engineered to link digital controllers directly with facility mains distribution logic.

Low-Power Coil Actuation

Protecting your controller against spikes

Generator circuit relays take a tiny, low-voltage electrical signal from your digital controller and use it to safely trigger heavy draw equipment like starter motors, block heaters, and cooling fans. By keeping the delicate control logic physically separated from high current power lines, relays make safe automation possible.

The Risk of Cheap or Failing Relays

Modern generator controllers are highly sensitive solid-state systems. When heavy components cycle on and off, they create inductive voltage spikes and high voltage back feeding.

Without a high quality relay acting as a reliable isolation barrier, these electrical surges can blast backward straight into your control panel, damaging expensive processors. Using genuine OEM switching components ensures that contact layouts, physical dimensions, and coil resistance parameters match your controller.

The Generator King supplies certified, heavy-duty switching elements built to stop electrical feedback in its tracks before it turns into a major equipment breakdown.

Reference Your Relay

OEM Part Identification

Authentic Electromechanical Circuit Relays:

  • Low-Voltage Control Relay: 12V
  • Standard Industrial Control Relay: 24V
  • High Capacity Single-Pole DC Relay: 12V – 40A
  • Heavy Industrial DC Control Relay: 24V – 40A
  • Specialised Alternator Protection Relay: 28V – 40A
  • High Voltage Alternating Current Relay: 230V AC – 10A

Complete Electrical Sub-System Peripherals:

  • Factory Specified SmartGen Automated Controller Modules
  • Intelligent Multi-Stage SmartGen Automated Battery Chargers
  • Heavy Duty Engine Block Heaters and Glow Plugs

FREQUENTLY ASKED QUESTIONS

Why do generator control panels use separate relays instead of switching components directly?

Digital controllers are delicate computers that only output tiny milliamp currents. Heavy components like fuel solenoids and starter starters require massive currents to operate. A circuit relay acts as a muscle bridge, allowing a tiny, safe signal from the computer to switch the high-current paths without overheating the central processing board.

What is the difference between a "making" contact and a "break" contact form?

A making contact is a Normally Open circuit that only completes the electrical path and transfers power when the relay coil receives an active signal. A break contact is a Normally Closed configuration that maintains continuous electrical flow natively, instantly breaking the connection when the coil is energised to stop an operation.

Why do some relay circuits include an external transistor or MOSFET device?

Small electronic control boards utilise transistors or MOSFETs to supply fast, clean DC switching control directly to the relay coil. These solid-state components act as the initial light switch, handling the inductive kickback produced when the relay coil de-energises, which shields the main microprocessor tracking from data errors.

Can a 24V relay module work inside a 12V generator starter electrical system?

No, a 24V relay requires a minimum voltage threshold to generate enough magnetic force to pull the mechanical armature closed. If installed in a 12V layout, the coil will fail to close the contacts completely, causing terminal chattering, high electrical resistance, arcing, and eventual component burnout.

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