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40.51.9.028.0300 Finder Miniature PCB relay 1pole 10A DC 28V
Finder 40.51.9.028.0300 is a miniature electromagnetic PCB relay with a 28 V DC coil, one normally open 10 A contact and AgNi contact material.
Why Choose the Finder 40.51.9.028.0300 Miniature PCB Relay?
The Finder 40.51.9.028.0300 is a compact and reliable miniature electromagnetic PCB relay designed for switching electrical loads in industrial control, automation and electronic equipment. Part of the proven Finder 40 Series, it combines a 28 V DC coil with one normally open contact rated at 10 A.
Its SPST-NO contact closes when the relay coil is energised, providing straightforward control of connected equipment from a separate low-voltage circuit. The relay uses durable AgNi contact material and provides reinforced isolation between the coil and contact circuits.
The 40.51.9.028.0300 features through-hole terminals and 5 mm pinning for direct PCB installation or use with a compatible Finder 95 Series socket. Its compact 29 × 12.4 × 25 mm enclosure helps conserve space in control boards and electronic assemblies.
Key Advantages
- Compact miniature relay for PCB and plug-in applications.
- 28 V DC coil for compatible industrial control circuits.
- Single normally open contact rated at 10 A.
- AgNi contact material supports dependable load switching.
- Low 0.65 W coil consumption.
- Through-hole construction supports secure PCB installation.
Key Features
- Finder 40 Series miniature PCB relay.
- 28 V DC nominal coil voltage.
- SPST-NO / 1 NO contact configuration.
- 10 A rated contact current.
- 250 V AC rated contact voltage.
- AgNi contact material.
- 1,200 Ω coil resistance.
- Monostable electromagnetic operation.
- Flux-proof RT II enclosure.
Reliable Normally Open Switching for Control Systems
Electromagnetic relays allow a low-power control circuit to switch an electrically isolated load circuit. Applying 28 V DC to the coil of the Finder 40.51.9.028.0300 closes its normally open contact, allowing current to flow through the connected load.
The relay’s simple normally open operation, compact dimensions and 10 A contact rating make it suitable for control boards, interface circuits and automated equipment. It can be soldered directly onto a PCB or installed in a compatible Finder socket where removable mounting is preferred.
Typical Applications
- Industrial automation and machine controls.
- Printed circuit boards and electronic assemblies.
- PLC interface and output circuits.
- Control panels and auxiliary switching systems.
- Heating, ventilation and building automation equipment.
- Lighting, signalling and load-control 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 | 28 V DC | |
| Contacts | 3NO | |
| Manufacturer | Finder | |
| Series | 40 Series | |
| Model | 40.51.9.028.0300 | |
| Product type | Miniature electromagnetic PCB relay | |
| Coil voltage | 28 V DC | |
| Coil resistance | 1,200 Ω | |
| Rated coil consumption | 0.65 W | |
| Rated coil current | 23 mA | |
| Coil operating range | 20.5–42 V DC | |
| Contact configuration | 1 normally open contact (SPST-NO / 1 NO) | |
| Rated contact current | 10 A | |
| Rated contact voltage | 250 V AC | |
| Maximum switching voltage | 400 V AC | |
| Rated load AC1 | 2,500 VA | |
| Contact material | AgNi | |
| Operating type | Monostable | |
| Mounting type | Through-hole PCB / compatible plug-in socket | |
| Pinning | 5 mm | |
| Protection category | RT II flux proof | |
| Dimensions (L × W × H) | 29 × 12.4 × 25 mm |
Frequently Asked Questions
What is the Finder 40.51.9.028.0300 used for?
This miniature electromagnetic relay switches electrical loads from an isolated control circuit in automation equipment, control panels and PCB assemblies.
What coil voltage does this relay require?
The Finder 40.51.9.028.0300 has a nominal 28 V DC coil.
What contact configuration does the relay have?
It has one normally open SPST-NO contact, which closes when the relay coil is energised.
What is the contact current rating?
The relay’s normally open contact has a rated current of 10 A.
How can this relay be installed?
The relay can be mounted directly onto a printed circuit board using its through-hole terminals or fitted into a compatible Finder plug-in socket.
Trusted Finder Relay Technology
Finder 40 Series miniature relays are widely used in industrial automation, electronic assemblies and control equipment where compact construction and dependable electrical switching are required.
