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40.51.9.028.0301 Finder Miniature PCB relay 1pole 10A DC 28V
Finder 40.51.9.028.0301 is an RT III wash-tight miniature PCB relay with a 28 V DC coil, one normally open 10 A contact and AgNi contact material.
Why Choose the Finder 40.51.9.028.0301 Wash-Tight PCB Relay?
The Finder 40.51.9.028.0301 is a compact and reliable wash-tight miniature electromagnetic 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 40.51.9.028.0301 features an RT III wash-tight enclosure suitable for compatible automated PCB cleaning processes. Its through-hole terminals, 5 mm pinning and compact 29 × 12.4 × 25 mm enclosure enable efficient installation in control boards and electronic assemblies.
Key Advantages
- Compact miniature relay for PCB and plug-in applications.
- RT III wash-tight construction for compatible PCB production processes.
- 28 V DC coil for industrial and electronic control circuits.
- Single normally open contact rated at 10 A.
- AgNi contact material supports dependable load switching.
- Low 0.65 W coil consumption.
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.
- RT III wash-tight enclosure.
Wash-Tight Switching for Industrial 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 40.51.9.028.0301 closes its normally open contact, allowing current to flow through the connected load.
The relay’s RT III enclosure protects its internal components during compatible PCB washing processes. Its compact dimensions, normally open operation and 10 A contact rating make it suitable for professionally manufactured control boards, interface circuits and automated equipment.
Typical Applications
- Printed circuit boards requiring wash-tight components.
- Industrial automation and machine controls.
- 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 | 40.51.9.028.0301 | |
| Product type | Wash-tight miniature electromagnetic 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 III wash tight | |
| Dimensions (L × W × H) | 29 × 12.4 × 25 mm |
Frequently Asked Questions
What is the Finder 40.51.9.028.0301 used for?
This wash-tight miniature relay switches electrical loads from an isolated control circuit in industrial automation equipment and PCB assemblies.
What coil voltage does this relay require?
The Finder 40.51.9.028.0301 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 does the RT III rating mean?
RT III identifies the relay as wash tight, making it suitable for compatible PCB washing processes when handled in accordance with Finder’s production guidance.
What is the contact current rating?
The relay’s normally open contact has a rated current of 10 A.
Trusted Finder Relay Technology
Finder 40 Series wash-tight relays provide compact and dependable switching for industrial control boards, automated equipment and professionally manufactured electronic assemblies.
