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40.31.9.021.2000 Finder Miniature PCB relay 1pole 10A DC 21V
Finder 40.31.9.021.2000 is a compact miniature PCB and plug-in relay with a 21 V DC coil and a 10 A SPDT silver cadmium oxide changeover contact.
Why Choose the Finder 40.31.9.021.2000 Miniature PCB Relay?
The Finder 40.31.9.021.2000 is a compact and dependable miniature electromechanical PCB relay designed for switching electrical loads in industrial automation, electronic equipment and control systems. As part of the established Finder Series 40, it combines a standard DC coil with a single changeover contact in a space-saving PCB and plug-in format.
This monostable relay provides one changeover contact rated at 10 A, allowing the controlled circuit to switch between normally closed and normally open paths. Its silver cadmium oxide contact material is designed for dependable switching performance across industrial and general-purpose control applications.
With a 21 V DC coil, a 700 Ω coil resistance and a compact enclosure measuring 12.4 × 29 × 25 mm, the Finder 40.31.9.021.2000 is well suited to densely populated control assemblies. It can be mounted directly onto a printed circuit board or installed through a compatible Finder Series 95 socket.
Key Advantages
- Compact miniature relay for PCB and socket installation.
- 10 A single changeover contact provides flexible circuit control.
- 21 V DC standard coil suits equipment using this control voltage.
- Silver cadmium oxide contacts provide dependable switching performance.
- Reinforced coil-to-contact insulation supports electrical safety.
- Flux-proof construction provides protection during PCB assembly.
Key Features
- Finder Series 40 miniature electromechanical relay.
- SPDT / 1 Form C contact configuration.
- 10 A rated contact current.
- 21 V DC standard coil.
- 700 Ω coil resistance.
- Silver cadmium oxide contact material.
- 3.5 mm contact pin pitch.
- Suitable for direct PCB mounting or use with a compatible Series 95 socket.
Reliable Switching for Electronic and Control Equipment
Electromechanical relays allow a low-power control signal to operate an electrically isolated load circuit. A changeover contact can direct the switched circuit between normally closed and normally open paths, providing flexible control for signalling, interlocking and automation functions.
The Finder Series 40 combines compact dimensions with robust contact performance and reinforced insulation. Its PCB-compatible construction makes it suitable for original equipment manufacturing, automation assemblies and replaceable socket-mounted relay systems.
Typical Applications
- Industrial automation and PLC interface circuits.
- Electronic control boards and embedded equipment.
- Heating, ventilation and air-conditioning controls.
- Lighting and electrical switching systems.
- Machine controls and production equipment.
- Domestic appliance and building automation circuits.
Technical Specifications
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| Device Type | Plug-in Relay | |
|---|---|---|
| Mounting Type | PCB, Plug-in socket | |
| Switching Current (A) | 10 A | |
| Coil / Supply Voltage | 21 V DC | |
| Contacts | 1 C/O | |
| Manufacturer | Finder | |
| Series | 40 Series | |
| Model | 40.31.9.021.2000 | |
| Product type | Miniature PCB / plug-in electromechanical relay | |
| Relay operation | Monostable | |
| Contact configuration | SPDT / 1 Form C | |
| Number of poles | 1 | |
| Rated contact current | 10 A | |
| Rated contact voltage | 250 V AC | |
| Coil voltage | 21 V DC | |
| Coil type | Standard DC coil | |
| Coil resistance | 700 Ω | |
| Contact material | Silver cadmium oxide 90/10 | |
| Contact pin pitch | 3.5 mm | |
| Mounting type | PCB or compatible socket | |
| Environmental protection | RT II flux proof | |
| Coil-to-contact impulse withstand voltage | 6 kV | |
| Coil-to-contact creepage and clearance | 8 mm | |
| Dimensions (W × L × H) | 12.4 × 29 × 25 mm |
Frequently Asked Questions
What is the Finder 40.31.9.021.2000 used for?
This relay provides electrically isolated switching for automation equipment, electronic control boards and industrial machinery.
What coil voltage does this relay require?
The Finder 40.31.9.021.2000 is designed for a 21 V DC coil supply.
What contact configuration does the relay provide?
The relay provides one SPDT changeover contact, also described as a 1 Form C configuration.
What contact material is used?
The relay uses silver cadmium oxide 90/10 contacts for dependable electrical switching.
How can the Finder 40.31.9.021.2000 be mounted?
The relay can be mounted directly onto a printed circuit board or installed through a compatible Finder Series 95 socket.
Trusted for Industrial Switching Worldwide
Finder miniature relays are used by electronic designers, automation engineers and equipment manufacturers to provide dependable switching within compact control and power circuits.
