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40.51.9.028.0001 Finder Miniature PCB relay 1pole 10A DC 28V
Finder 40.51.9.028.0001 is an RT III wash-tight miniature PCB relay with a 28 V DC coil, one 10 A changeover contact and AgNi contact material.
Why Choose the Finder 40.51.9.028.0001 Wash-Tight PCB Relay?
The Finder 40.51.9.028.0001 is a compact and dependable wash-tight miniature electromagnetic relay designed for switching electrical loads in industrial control, automation and electronic equipment. Part of the established Finder 40 Series, it combines a 28 V DC coil with one changeover contact rated at 10 A.
Its SPDT contact configuration provides normally open and normally closed switching paths, offering flexibility for interface, signalling and load-control circuits. The relay uses durable AgNi contact material and provides reinforced isolation between the coil and contact circuits.
The 40.51.9.028.0001 features a wash-tight RT III enclosure, helping protect its internal components during suitable automated PCB cleaning processes. Through-hole terminals and 5 mm pinning support direct PCB installation, while the compact 29 × 12.4 × 25 mm enclosure helps conserve board space.
Key Advantages
- Compact miniature relay for PCB and plug-in applications.
- Wash-tight RT III construction for compatible PCB production processes.
- 28 V DC coil for industrial and electronic control circuits.
- Flexible single changeover 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.
- SPDT / 1 CO 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 relatively low-power control circuit to switch an electrically isolated load circuit. Applying 28 V DC to the coil of the Finder 40.51.9.028.0001 transfers its changeover contact between the normally closed and normally open circuits.
Unlike the standard flux-proof version, this model has an RT III wash-tight enclosure intended for production environments where assembled circuit boards undergo a compatible washing process. Its compact format, 10 A contact rating and changeover functionality make it suitable for industrial control boards and electronic equipment.
Typical Applications
- Industrial automation and machine controls.
- Printed circuit boards requiring wash-tight components.
- PLC interface and output circuits.
- Control panels and auxiliary switching systems.
- Heating, ventilation and building automation equipment.
- Signalling, interlocking 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 | 1 C/O | |
| Manufacturer | Finder | |
| Series | 40 Series | |
| Model | 40.51.9.028.0001 | |
| 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 changeover contact (SPDT / 1 CO) | |
| 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 40.51.9.028.0001 used for?
This wash-tight miniature relay switches isolated electrical circuits in industrial automation equipment, control panels and PCB assemblies.
What coil voltage does this relay require?
The Finder 40.51.9.028.0001 has a nominal 28 V DC coil.
What contact configuration does the relay have?
It has one SPDT changeover contact, providing normally open, normally closed and common connections.
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 changeover contact has a rated current of 10 A.
Trusted Finder Relay Technology
Finder 40 Series wash-tight relays provide compact and reliable switching for industrial control boards, automated equipment and professionally manufactured electronic assemblies.
