40.61.9.021.1003 Finder Miniature PCB relay 1pole 16A DC 21V

Why Choose the Finder 40.61.9.021.1003 Miniature Power Relay?

The Finder 40.61.9.021.1003 is a miniature electromechanical power relay from the Finder Series 40, designed for industrial automation, electronic control equipment and electrical load switching. It features a 21 V DC standard coil and belongs to the Type 40.61 single-changeover relay family.

The standard Finder 40.61 platform provides one changeover contact (SPDT / 1 CO) with a 16 A rated contact current and 250 V AC rated contact voltage. This allows a compatible low-voltage control circuit to operate a separate electrical load, making the relay useful in machinery, control panels and PCB-based electronic assemblies.

The 21 V DC coil has a nominal resistance of 700 Ω and draws approximately 30 mA at its rated voltage. The relay uses the compact Series 40.61 PCB/plug-in format, with nominal body dimensions of 12.4 × 29 × 25 mm. The exact .1003 suffix has not been independently confirmed against an exact-part manufacturer listing, so its contact arrangement details, contact material and enclosure characteristics should be verified before final specification.

Key Advantages

• 21 V DC standard coil for compatible low-voltage control circuits.
• 16 A contact rating under the standard Finder 40.61 specification.
• Single changeover contact provides flexible control of normally open and normally closed circuits.
• 700 Ω nominal coil resistance supports predictable control circuit design.
• Approximately 30 mA nominal coil current for compatible electronic control outputs.
• Approximately 0.65 W nominal coil consumption.
• 250 V AC rated contact voltage for suitable electrical loads.
• 4000 VA AC1 switching capacity under standard resistive-load conditions.
• Compact housing supports space-efficient PCB and equipment layouts.
• Monostable operation returns the contacts to their normal position when coil power is removed.
• PCB/plug-in relay design supports suitable mounting arrangements.
• Part of the established Finder Series 40 relay range.

Key Features

• Finder Series 40 miniature power relay.
• Type 40.61 single-pole relay platform.
• 21 V DC nominal coil voltage.
• Standard DC coil, identified by coil code 9.021.
• 700 Ω nominal coil resistance.
• 30 mA nominal coil current.
• Approximately 0.65 W nominal coil consumption.
• 15.3–31.5 V DC standard coil operating range under specified conditions.
• 16 A rated contact current for the standard Type 40.61 contact system.
• 250 V AC rated contact voltage.
• 400 V AC maximum switching voltage under applicable conditions.
• 4000 VA rated AC1 switching capacity.
• SPDT / 1 CO / 1 Form C standard contact arrangement.
• Monostable, non-latching operation.
• 5 mm contact pin pitch on the standard 40.61 platform.
• PCB/plug-in miniature relay construction.
• 12.4 × 29 × 25 mm nominal body dimensions.
• Suitable for industrial automation and electronic switching equipment.

21 V DC Coil Operation and Industrial Switching Considerations

The Finder 40.61.9.021.1003 belongs to a relay family that uses an electromagnetic coil to operate a mechanical contact system. With the standard changeover configuration, energising the coil transfers the common contact from the normally closed terminal to the normally open terminal. Removing coil power returns the relay to its normal, de-energised state.

The 21 V DC standard coil has a nominal resistance of 700 Ω and draws approximately 30 mA at its rated voltage. The control circuit must be capable of supplying the required current. When driven by a transistor, PLC output or other electronic switching device, suitable coil suppression should be considered to limit inductive voltage transients.

The standard 16 A Series 40.61 contact rating applies to specified switching conditions and should not be interpreted as a universal rating for every load. Motors, transformers, capacitive loads and LED drivers can produce significant starting or inrush currents. Engineers should evaluate the actual utilisation category, load voltage, switching frequency and expected electrical life before selecting the relay.

The compact PCB/plug-in format is useful in equipment where space is limited. However, the complete 40.61.9.021.1003 part number should be checked when selecting a socket, PCB footprint or replacement relay. In particular, the .1003 suffix should not be assumed to have the same contact and enclosure construction as the more common .0000, .1000 or .1001 variants without confirmation from Finder.

Typical Applications

• Industrial automation and machinery control.
• 21 V DC control circuits.
• PLC interfacing with compatible coil drive outputs.
• Electrical control panels and switching assemblies.
• PCB-based electronic control equipment.
• Industrial signalling and indication circuits.
• Building automation and equipment control.
• Auxiliary control and interlocking circuits.
• Packaging and production machinery.
• OEM electrical and electronic assemblies.
• General-purpose electrical load switching.
• Maintenance and replacement of compatible Finder Series 40.61 relays.