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40.31.9.125.0300 Finder Miniature PCB relay 1pole 10A DC 125V
Finder 40.31.9.125.0300 is a flux-proof electromechanical PCB relay with one 12 A normally open AgNi contact, a 125 V DC coil and a 5.2 mm pin length.
Why Choose the Finder 40.31.9.125.0300 PCB Relay?
The Finder 40.31.9.125.0300 is a compact and dependable electromechanical PCB relay designed for switching electrical loads in industrial controls, automation equipment and electronic assemblies. As part of the established Finder Series 40 relay range, it combines a high-capacity contact system with a sensitive DC coil and a space-efficient enclosure.
This relay features a single normally open contact for straightforward load switching. Its AgNi contact material supports dependable general-purpose switching, while the RT II flux-proof enclosure protects the internal mechanism during compatible printed circuit board soldering processes.
With a 125 V DC coil, a contact rating of up to 12 A when PCB-mounted and a 5.2 mm pin length, the 40.31.9.125.0300 is suitable for industrial controllers, machinery interfaces, control panels and electronic equipment requiring reliable load switching.
Key Advantages
- Compact PCB relay designed for industrial control applications.
- Single normally open contact for straightforward load switching.
- Rated for up to 12 A on a printed circuit board.
- 125 V DC coil suitable for high-voltage DC control circuits.
- AgNi contact material supports dependable electrical performance.
- Suitable for direct PCB mounting or use with a compatible relay socket.
Key Features
- Finder Series 40 electromechanical relay.
- 1 NO contact configuration.
- 12 A PCB contact rating and 10 A socket contact rating.
- 125 V DC standard coil with a rated power of 0.65 W.
- AgNi contact material.
- 5.2 mm PCB pin length.
- Flux-proof RT II protection category.
- High electrical isolation between the coil and contact.
Reliable Switching for Industrial Control Systems
Electromechanical relays such as the Finder 40.31 provide galvanic separation between a control circuit and the connected load. Applying the rated voltage to the coil closes the normally open contact, allowing machinery, lighting, heating equipment and other electrical loads to be controlled by an automation system.
The Series 40 platform is engineered for PCB and socket applications where compact dimensions, high switching capacity and dependable isolation are required. Its normally open contact and high-voltage DC coil make this variant a practical choice for new equipment and replacement applications.
Typical Applications
- Industrial control panels and automation equipment.
- Programmable controller output interfaces.
- Electronic circuit boards and control modules.
- Heating, ventilation and air-conditioning controls.
- Lighting and building automation systems.
- Machinery, pumps and small motor controls.
Technical Specifications
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| Device Type | Plug-in Relay | |
|---|---|---|
| Mounting Type | PCB, Plug-in socket | |
| Switching Current (A) | 12 A | |
| Load Voltage | 400 V AC | |
| Coil / Supply Voltage | 125 V DC | |
| Contacts | 1NO | |
| Manufacturer | Finder | |
| Series | 40 Series | |
| Model | 40.31.9.125.0300 | |
| Product type | Electromechanical PCB relay | |
| Contact configuration | 1 NO | |
| Rated current | 12 A PCB / 10 A socket | |
| Maximum peak current | 20 A | |
| Rated voltage | 250 V AC | |
| Maximum switching voltage | 400 V AC | |
| AC1 rated load | 3000 VA | |
| AC15 rated load at 230 V AC | 1000 VA | |
| Single-phase motor rating | 0.55 kW | |
| Coil voltage | 125 V DC | |
| Rated coil power | 0.65 W | |
| Contact material | AgNi | |
| Minimum switching load | 300 mW at 5 V / 5 mA | |
| Operate / release time | 7 / 3 ms | |
| Mechanical life | 10 million cycles | |
| Electrical life at rated load | 200,000 cycles | |
| Coil-to-contact dielectric strength | 4000 V AC | |
| Open-contact dielectric strength | 1000 V AC | |
| Impulse withstand voltage | 6 kV | |
| Protection category | RT II flux-proof | |
| Mounting type | Through-hole PCB mounting / compatible relay socket | |
| Pin length | 5.2 mm | |
| Ambient temperature range | −40 to +85 °C |
Frequently Asked Questions
What is the Finder 40.31.9.125.0300 used for?
This relay switches electrical loads in industrial controls, automation equipment, electronic assemblies and building-control systems.
What contact configuration does this relay have?
The 40.31.9.125.0300 has a single normally open contact.
What coil voltage does the relay require?
This relay is designed for a nominal 125 V DC coil supply.
What current can the relay switch?
The relay is rated for up to 12 A when mounted directly on a PCB or 10 A when used with a compatible socket.
How is the Finder 40.31.9.125.0300 installed?
The relay can be installed directly on a printed circuit board using its through-hole pins or fitted into a compatible Finder relay socket.
Trusted for Industrial Switching Worldwide
Finder Series 40 relays are widely used by control-panel builders, automation engineers and equipment manufacturers for dependable switching, robust electrical isolation and flexible PCB or socket installation.
