Relay

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Power relays open and close mechanical contacts via a coil current, switching high power with a low-power control signal. They are widely used for load switching and safety disconnection in industrial control, automotive, and appliances.

Selection guide

Match the coil voltage (VDC/VAC) to your control circuit — 5V, 12V, and 24V are most common.
Contact current/voltage rating must exceed the actual load; allow extra margin for inrush loads like motors and lamps.
Choose the contact form (1 Form A/B/C) for your circuit and check latching vs non-latching.
Verify mounting (PCB vs socket/DIN rail) and that the footprint matches your existing design.

Frequently asked questions

How do I choose the relay coil voltage?

Match it to your control signal (MCU/PLC output). Use a 5V coil for 5V logic, a 24V coil for 24V industrial control, and confirm the drive current is within your output capability.

How do I find a replacement for a discontinued relay?

Compare parts with the same or compatible coil voltage, contact rating, contact form, and footprint. PartsPlan uses a dimension-first algorithm to prioritize footprint-compatible alternatives.

Mechanical relay vs SSR (solid-state)?

Mechanical relays are low-cost with low leakage but have contact wear; SSRs are contactless with long life and fast switching, but require attention to heat and leakage current.