Omron 1 Channel 5V Solid State Relay

Compact 5V DC control module for switching small AC loads. This single-channel PCB SSR module is built around an Omron G3MB-202P solid-state relay, giving you a logic-level 5V input and a 100–240VAC output path rated up to 2A.

Why this over a mechanical relay?

• No moving contacts: the phototriac SSR switches silently and avoids contact wear when used within its rating.
• Zero-cross AC switching: the G3MB-202P family is built for clean on/off control of small AC loads.
• Simple wiring: screw terminals on the module handle the AC side, with low-voltage control pins for your controller circuit.

Specifications

• Relay marking: Omron G3MB-202P
• Control input: 5V DC nominal; Omron 5V G3MB versions operate over 4–6VDC
• Output load: 100–240VAC, 50/60Hz, 0.1–2A general-purpose AC load
• Switching type: zero-cross solid-state relay with input resistor and snubber in the G3MB-202P relay family
• Module style: one-channel PCB module with screw terminals and mounting holes

Use in printer and controller builds

Use this when a 5V control signal needs to switch a small AC accessory within the relay rating. For clean wiring around the module, pair it with Wago 221-415 lever connectors or heat-resistant 26AWG stranded FEP wire on the low-voltage side.

Gotchas

• AC output only: this triac SSR is not for DC load switching.
• Respect the 2A limit: do not use it for beds, chamber heaters, or any load above the Omron rating.
• Mains safety applies: enclosure, strain relief, insulation, fusing, and local electrical rules are on the build.