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Finder 55.34.9.140.0040 – 55 Series Miniature General Purpose Relays
Finder 55.34.9.140.0040 miniature industrial plug-in relay with a 140 V DC coil, four changeover contacts, 7 A rated contact current, silver-nickel contacts, lockable test button and mechanical indicator for industrial automation and electrical control applications.
£10.99
Why Choose the Finder 55.34.9.140.0040 Industrial Relay?
The Finder 55.34.9.140.0040 is a compact 7 A industrial electromechanical relay featuring a 140 V DC operating coil, four changeover contacts and a convenient plug-in mounting arrangement. Part of the Finder 55 Series, this relay is designed for industrial automation, electrical control panels, auxiliary switching and equipment requiring multiple contact circuits.
Its 4 CO / 4PDT contact configuration enables four separate changeover circuits to be controlled by a single electromagnetic coil. Each pole includes normally open and normally closed connections, providing flexibility for control, signalling, interlocking and auxiliary switching applications.
The Finder 55.34.9.140.0040 features silver-nickel (AgNi) contacts, a lockable test button and a mechanical indicator. The plug-in design supports installation into compatible Finder 94 Series sockets, making the relay suitable for control panel construction, commissioning and maintenance.
Key Advantages
- 140 V DC nominal coil voltage for compatible industrial DC control supplies.
- Four changeover contacts (4 CO / 4PDT) for flexible multi-circuit switching.
- 7 A rated contact current for appropriately rated electrical loads.
- 250 V AC rated contact voltage for general-purpose control applications.
- Silver-nickel (AgNi) contacts for reliable electromechanical switching.
- Lockable test button for manual contact operation during suitable maintenance procedures.
- Mechanical indicator provides a visible indication of relay contact operation.
- Plug-in mounting simplifies replacement and servicing.
- Finder 94 Series socket compatibility supports integration into control panels.
- Compact four-pole design reduces the space required for multiple switching circuits.
- Monostable operation returns the contacts to their normal state when the coil is de-energised.
- Industrial temperature capability supports use in demanding electrical installations.
Key Features
- Finder 55 Series miniature general-purpose relay.
- 55.34 four-pole plug-in relay type.
- 140 V DC nominal coil.
- DC electromagnetic operation.
- Four changeover contacts (4 CO).
- Four-pole double-throw (4PDT) configuration.
- 7 A rated contact current.
- 15 A maximum peak contact current under specified conditions.
- 250 V AC rated contact voltage.
- 1,750 VA AC1 rated resistive switching capacity.
- Silver-nickel (AgNi) contact material.
- Lockable test button and mechanical indicator.
- Plug-in connection for compatible relay sockets.
- Standard industrial relay construction.
- Monostable switching mechanism.
Technical verification note: The 140 V DC coil, 4PDT contact arrangement, 7 A contact rating, AgNi contacts and physical dimensions are supported by an exact-part product listing. Other figures identified as family ratings should be checked against the current Finder datasheet for the precise application. The coil resistance and permissible operating voltage range for this particular 140 V DC variant should also be confirmed before installation.
Versatile Four-Pole Changeover Switching
The Finder 55.34.9.140.0040 incorporates four changeover contacts, providing four separate switching paths operated by one electromagnetic coil. Each pole includes a common terminal, a normally closed terminal and a normally open terminal.
When the 140 V DC coil is energised, the relay changes the state of all four contact sets. When the coil supply is removed, the contacts return to their normal positions. This arrangement is useful where a single control signal must switch multiple auxiliary circuits simultaneously.
The silver-nickel contact material supports general-purpose industrial switching. The relay's 7 A contact rating applies under specified load conditions; inductive loads, DC switching and frequent operation may require additional derating or contact protection.
Lockable Test Button and Mechanical Indicator
A distinguishing feature of the Finder 55.34.9.140.0040 is its 0040 option configuration, which includes a lockable test button and mechanical indicator. The mechanical indicator provides visual feedback of the relay's operating state, assisting technicians during commissioning and troubleshooting.
The test button can be used to actuate the relay contacts manually. Finder's test-button design also provides a locking function when configured according to the manufacturer's instructions. Manual testing must be carried out only where it is safe to operate the connected circuits, as the test button can change the state of live equipment independently of the electrical coil signal.
The relay's plug-in construction also supports convenient replacement using a compatible Finder 94 Series socket, reducing the need to disturb permanent panel wiring during maintenance.
Typical Applications
- Industrial automation and control panels.
- Machinery auxiliary control circuits.
- Multi-circuit electrical switching.
- Industrial signalling and indication systems.
- Process control equipment.
- Electrical interlocking circuits.
- Building automation and control systems.
- Alarm and monitoring equipment.
- OEM industrial electrical assemblies.
- Control panels requiring manual relay testing and mechanical indication.
- Plug-in relay installations requiring four changeover contacts.
- Equipment with a compatible 140 V DC control supply.
Technical Specifications
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| Device Type | Plug-in Relay | |
|---|---|---|
| Mounting Type | Plug-in socket | |
| Load Voltage | 250 V AC | |
| Switching Current (A) | 7 A | |
| Manufacturer | Finder | |
| Manufacturer part number | 55.34.9.140.0040 | |
| Series | 55 Series | |
| Relay type | 55.34 | |
| Product category | Miniature general-purpose electromechanical relay | |
| Nominal coil voltage | 140 V DC | |
| Coil voltage type | DC | |
| Contact configuration | 4 CO / 4PDT | |
| Number of poles | 4 | |
| Number of changeover contacts | 4 | |
| Contact material | Silver nickel (AgNi) | |
| Rated contact current | 7 A | |
| Maximum peak contact current | 15 A (55.34 family rating) | |
| Rated contact voltage | 250 V AC | |
| Maximum switching voltage | 250 V AC (55.34 family rating) | |
| Rated resistive switching capacity (AC1) | 1,750 VA | |
| Rated AC15 switching capacity at 230 V AC | 350 VA (55.34 family rating) | |
| Single-phase motor rating at 230 V AC | 0.125 kW (55.34 family rating) | |
| Mechanical life with DC coil | 50 million cycles (55.34 family rating) | |
| Electrical life at rated AC1 load | 150,000 cycles (55.34 family rating) | |
| Nominal operate time | 11 ms (55.34 family rating) | |
| Nominal release time | 3 ms (55.34 family rating) | |
| Coil-to-contact impulse withstand voltage | 4 kV (55.34 family rating) | |
| Dielectric strength between open contacts | 1,000 V AC (55.34 family rating) | |
| Ambient operating temperature | −40 to +85 °C (55.34 family rating) | |
| Environmental protection | RT I (55.34 family classification) | |
| Relay operating principle | Monostable electromagnetic | |
| Mounting type | Plug-in / socket-mounted | |
| Connection type | Plug-in terminals | |
| Compatible socket family | Finder 94 Series, subject to exact socket selection | |
| Manual test facility | Lockable test button | |
| Position indication | Mechanical indicator | |
| Body dimensions | 27.7 × 20.7 × 37.2 mm | |
| Application category | Industrial automation, electrical control and auxiliary switching |
Frequently Asked Questions
What is the Finder 55.34.9.140.0040 used for?
The Finder 55.34.9.140.0040 is a four-pole industrial relay designed for auxiliary electrical switching and control applications. Typical uses include industrial automation, machinery control, electrical signalling, interlocking and multi-circuit switching.
What coil voltage does the Finder 55.34.9.140.0040 require?
The relay has a 140 V DC nominal coil. It is intended for a compatible DC control supply. The exact permissible operating voltage range and coil resistance should be verified against Finder's documentation for this specific variant before installation.
How many contacts does the Finder 55.34.9.140.0040 have?
The relay features four changeover contacts (4 CO / 4PDT). Each pole provides common, normally open and normally closed connections, allowing four separate circuits to be switched by a single electromagnetic coil.
What does the 0040 suffix mean on the Finder 55.34.9.140.0040?
The 0040 suffix identifies the standard silver-nickel (AgNi) contact version fitted with a lockable test button and mechanical indicator. The test button supports manual operation during appropriate commissioning procedures, while the indicator shows the relay's mechanical switching state.
What are the contact rating and mounting type of the Finder 55.34.9.140.0040?
The relay has a 7 A rated contact current and belongs to the Finder 55.34 family with a 250 V AC rated contact voltage. It uses a plug-in mounting arrangement designed for compatible Finder 94 Series relay sockets. The selected socket and relay must be rated for the intended load and installation conditions.
Designed for Industrial Automation and Electrical Engineering Applications
Finder 55 Series industrial relays offer versatile electromechanical switching for automation engineers, electrical panel builders and maintenance professionals. The Finder 55.34.9.140.0040 combines a 140 V DC coil, four 7 A changeover contacts, silver-nickel contact material, a lockable test button and a mechanical indicator in a compact plug-in relay design.
