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40.31.9.021.0301 Finder Miniature PCB relay 1pole 10A DC 21V
Finder 40.31.9.021.0301 is an RT III wash-tight miniature PCB and plug-in relay with a 21 V DC coil and a 10 A SPST-NO silver-nickel contact.
Why Choose the Finder 40.31.9.021.0301 Wash-Tight Miniature PCB Relay?
The Finder 40.31.9.021.0301 is a compact and dependable wash-tight 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 normally open contact in a space-saving PCB and plug-in format.
This monostable relay provides a single normally open contact rated at 10 A. Its silver-nickel contact material delivers dependable switching performance, while reinforced insulation between the coil and contacts supports safe integration into industrial and electronic equipment.
With a 21 V DC coil, an RT III wash-tight enclosure and compact dimensions of 12.4 × 29 × 25 mm, the Finder 40.31.9.021.0301 is well suited to printed circuit board assemblies that undergo compatible cleaning processes. It can be mounted directly onto a PCB or installed through a compatible Finder Series 95 socket.
Key Advantages
- Compact miniature relay for PCB and socket installation.
- RT III wash-tight construction supports compatible PCB cleaning processes.
- 10 A normally open contact supports a wide range of switching duties.
- 21 V DC standard coil suits equipment using this control voltage.
- Silver-nickel contacts provide dependable electrical performance.
- Reinforced coil-to-contact insulation supports safe equipment integration.
Key Features
- Finder Series 40 miniature electromechanical relay.
- SPST-NO / 1 Form A contact configuration.
- 10 A rated contact current.
- 21 V DC standard coil.
- 700 Ω coil resistance.
- Silver-nickel contact material.
- RT III wash-tight environmental protection.
- 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. The normally open contact closes when the coil is energised, allowing electronic controllers and automation equipment to switch higher-current devices.
The RT III enclosure fitted to this Finder Series 40 relay provides wash-tight protection for compatible printed circuit board production processes. Its compact construction, standard DC coil and reinforced insulation make it suitable for dependable switching within industrial and electronic equipment.
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 | |
| Load Voltage | 400 V AC | |
| Switching Current (A) | 10 A | |
| Coil / Supply Voltage | 21 V DC | |
| Contacts | 1NO | |
| Manufacturer | Finder | |
| Series | 40 Series | |
| Model | 40.31.9.021.0301 | |
| Product type | Wash-tight miniature PCB / plug-in electromechanical relay | |
| Relay operation | Monostable | |
| Contact configuration | SPST-NO / 1 Form A | |
| Number of poles | 1 | |
| Rated contact current | 10 A | |
| Rated contact voltage | 250 V AC | |
| Maximum switching voltage | 400 V AC | |
| Coil voltage | 21 V DC | |
| Coil type | Standard DC coil | |
| Coil resistance | 700 Ω | |
| Contact material | Silver nickel | |
| Contact pin pitch | 3.5 mm | |
| Mounting type | PCB or compatible socket | |
| Environmental protection | RT III wash tight | |
| 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 40.31.9.021.0301 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 40.31.9.021.0301 is designed for a 21 V DC coil supply.
What contact configuration does the relay provide?
The relay provides one SPST-NO normally open contact, also described as a 1 Form A configuration.
What does the RT III wash-tight rating mean?
The RT III enclosure classification identifies the relay as wash tight, providing additional protection during compatible printed circuit board cleaning processes.
How can the Finder 40.31.9.021.0301 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.
