- 1-807-228-1532
- support@dnb3d.ca
- Free Shipping Orders over $175
- Conditions Apply
Reliable Omron G3NB-240B-1 Solid State Relay for compatible electronics control, 3D printer heated bed switching, automation panels, enclosure wiring, and AC load control applications.
$42.95
The Omron G3NB-240B-1 Solid State Relay is an SSR module used for switching compatible AC loads with a low-voltage DC control signal. This product is marked as an Omron G3NB-240B-1 with a 5–24VDC input, 24–220VAC load output, and 40A rating. It can be used in electronics projects, automation panels, control boxes, 3D printer heated bed systems, enclosure wiring, and other compatible AC load switching applications.
A solid state relay has no moving mechanical contacts. Instead, it uses electronic switching to control the load. This makes an SSR useful where quiet switching, fast response, and long service life are preferred over a mechanical relay. However, SSRs must be installed correctly, wired safely, and cooled properly for the actual load being switched.
The input side of this relay is marked for 5–24VDC control. This makes it suitable for compatible DC control circuits, printer control boards, microcontroller outputs, PLC outputs, and automation wiring where the controller output matches the SSR input requirements. Always confirm control voltage, input polarity, and wiring before applying power.
The load side is marked for 24–220VAC switching. This means the relay is intended for compatible AC loads within that voltage range. The terminals are marked for load connection, while the input terminals are marked with polarity. Do not use this AC-output SSR for DC load switching unless the exact relay specification confirms DC load compatibility.
The Omron G3NB-240B-1 is listed in Omron’s G3NB specifications as a 40A model when used with a suitable heat sink. Omron’s published specification also notes a much lower current limit without a heat sink, so real-world current capacity depends heavily on heat sinking, enclosure temperature, airflow, wiring, and mounting. For heated beds or higher-current loads, proper heat dissipation is not optional.
Solid state relays are often used in 3D printers to switch AC heated beds from a low-voltage controller output. When used correctly, an SSR can let the printer control a higher-voltage AC bed heater while keeping the controller output on the low-voltage control side. This setup must be wired carefully, fused correctly, grounded properly, and tested before unattended printer operation.
The Omron G3NB series includes zero-cross switching models. Zero-cross SSRs switch near the AC waveform zero crossing, which can reduce electrical noise and stress for many resistive AC loads. This type of SSR is commonly used for heater loads, but it still must be matched to the load type and application.
The product label includes the instruction to earth the mounting rail. This is important because SSR installations may involve AC mains wiring, metal panels, heat sinks, DIN rails, or grounded enclosures. Always follow electrical code, grounding requirements, and safe enclosure practices when installing SSR hardware.
This product may be used in circuits involving AC mains voltage. Installation should only be completed by someone qualified to work with electrical wiring. Incorrect SSR wiring can damage equipment, create shock hazards, overheat components, or create a fire risk. Always use proper fusing, wire gauge, heat sinking, strain relief, grounding, and enclosure protection.
For related components, browse the Electronics category or the 3D Printer Parts category. This SSR can be paired with controller boards, heater wiring, cartridge heaters, power supplies, terminal blocks, cooling fans, and other electronics hardware from dnb3D.
For current ratings, heat sink requirements, input specifications, and load limits, review the Omron G3NB solid state relay specifications before installation.
Every order is hand-inspected and precision-shipped from dnb3D in Marathon, Ontario. Whether you are repairing a printer, building a control enclosure, wiring an automation panel, or setting up a heated bed control system, this Omron G3NB-240B-1 Solid State Relay provides a compact SSR option for compatible AC load switching applications.
The Omron G3NB-240B-1 Solid State Relay is a 40A AC-output SSR with 5–24VDC input for compatible electronics control, automation, 3D printer heated bed switching, and AC load applications.
| Product Type | Solid state relay / SSR |
|---|---|
| Brand | Omron |
| Model | G3NB-240B-1 |
| Control Input | 5–24VDC |
| Load Output | 24–220VAC |
| Rated Load Current | 40A with suitable heat sink, based on Omron G3NB model specifications |
| Load Current Range | 0.1A to 40A with heat sink; lower current capacity without heat sink |
| Inrush Current | 410A, 60Hz, 1 cycle |
| Output Type | AC load switching solid state relay |
| Switching Function | Zero-cross SSR style, based on Omron G3NB series specification |
| Isolation | Photocoupler isolation, based on Omron G3NB series specification |
| Input Terminal Marking | 3+ / 4- input |
| Load Terminal Marking | 1 / 2 load |
| Mounting Note | Label indicates: earth the mounting rail |
| Common Applications | 3D printer heated bed switching, electronics control, automation panels, heater control, enclosure wiring, compatible AC load switching, and control cabinet projects |
| SKU | DB-0708-7590 |
| Installation Warning | AC mains wiring can be dangerous. Confirm voltage, load current, heat sink, fuse protection, wire gauge, grounding, enclosure safety, and controller compatibility before installation. |
| Fulfillment | Hand-inspected and precision-shipped from dnb3D in Marathon, Ontario, Canada |
Before installing the Omron G3NB-240B-1 Solid State Relay, confirm that your control circuit, load voltage, load current, controller output, and wiring design match the relay rating. This relay is marked for 5–24VDC input and 24–220VAC load output.
High-current SSRs generate heat during operation. The 40A rating depends on proper heat sinking, mounting, ambient temperature, airflow, and load conditions. Do not run high-current loads without a suitable heat sink and thermal planning.
Use proper fuse protection or circuit protection for the load being switched. The fuse, wire gauge, terminal blocks, enclosure, and SSR must all be sized for the actual load current and local electrical requirements.
The input terminals are marked 3+ and 4-. Confirm polarity before connecting a printer control board, microcontroller, PLC, or other DC output. Incorrect input wiring may prevent operation or damage electronics.
The load terminals are marked 1 and 2. Wire the SSR according to your electrical design and applicable safety standards. Do not leave exposed AC terminals accessible after installation.
The product label notes to earth the mounting rail. When installed in a control panel, machine enclosure, DIN rail setup, or metal cabinet, follow proper grounding practices and local electrical code.
Install the SSR inside a suitable enclosure that protects users from exposed terminals, strain on wires, accidental contact, dust, debris, and mechanical damage. Use strain relief and secure wiring so terminals cannot loosen during machine operation.
After installation, test the SSR under controlled conditions. Monitor relay temperature, load switching, controller behaviour, heater response, and enclosure temperature before using the machine for long prints or unattended operation.
Periodically inspect terminal screws, wiring insulation, heat sink mounting, enclosure ventilation, and signs of overheating. Replace damaged wiring, loose terminals, or overheated components before continued use.
This product may be used with AC mains voltage. Installation should be completed by a qualified person familiar with electrical safety, fusing, grounding, wire sizing, and control panel wiring. Incorrect installation can create shock, fire, or equipment damage hazards.
Every order is hand-inspected before shipping. dnb3D precision-ships electronics, 3D printer parts, SSRs, heater components, and control hardware across Canada from our Ontario facility, helping builders and technicians receive clean, usable parts ready for careful installation.
At dnb3D, we don’t just ship boxes—we manufacture solutions. Operating our Industry 4.0 micro-factory in Marathon, Ontario, means your order is handled by the same people who design and test these components.
Ready to Ship (3D Printer Parts & Hardware): Finished, inspected, and on the shelf. Dispatched within 1 to 2 business days.
In-House Manufacturing (Laser, Plasma, 3D Prints): These items are manufactured “fresh” to order. Please allow 3 to 5 business days for precision cutting and finishing.
Custom Projects: Bespoke designs require a consultation and a locked-in timeline before production begins.
We ship nationwide across Canada and the USA. Centrally located on the North Shore of Lake Superior, we are uniquely positioned to get your products moving quickly to either coast.
We stand behind every weld, cut, and print. If a product doesn’t meet your expectations, contact the Hub within 30 days. If we wouldn’t put it in our own shop, we won’t let it sit in yours.
Standard Items: Contact us within 30 days for return authorization. Items must be in original, unused condition.
Custom/Personalized Orders: Digitally fabricated to your exact specs (names, custom dimensions, or unique finishes) are final sale once production begins.
Shipping Costs: Return shipping is the responsibility of the customer unless the item arrived damaged or defective.
Have questions about a specific build? Click here to contact the shop.
