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65.31.9.048.4000 Finder Power relay 1NO 30A DC 48VNO
Finder 65.31.9.048.4000 is a 20 A industrial electromechanical power relay with a 48 V DC coil, one normally open and one normally closed contact, silver tin oxide contact material, Faston 250 terminals and rear flange mounting for industrial automation and electrical control applications.
£12.02
Why Choose the Finder 65.31.9.048.4000 Power Relay?
The Finder 65.31.9.048.4000 is a heavy-duty 20 A industrial electromechanical power relay designed for reliable switching in machinery, automation equipment and electrical control panels. Part of the Finder 65 Series, this model combines a 48 V DC operating coil with one normally open and one normally closed contact (1 NO + 1 NC).
Featuring silver tin oxide (AgSnO₂) contacts, the Finder 65.31.9.048.4000 provides dependable switching performance for compatible industrial loads. Its 20 A rated contact current, 250 V AC rated contact voltage and 5,000 VA AC1 resistive switching capacity make it suitable for industrial heating equipment, machinery, electrical load control and automation systems.
The relay's two independently wired contacts provide complementary switching functions. When the 48 V DC coil is energised, the normally open contact closes while the normally closed contact opens. Its Faston 250 quick-connect terminals and rear flange mounting arrangement provide a practical installation solution for compatible industrial equipment.
Key Advantages
- 20 A rated contact current for demanding electrical switching applications.
- 48 V DC operating coil for compatible industrial DC control systems.
- 1 NO + 1 NC contact configuration for complementary switching functions.
- Silver tin oxide (AgSnO₂) contacts for dependable switching performance.
- 5,000 VA AC1 switching capacity for appropriately rated resistive loads.
- 1.3 W nominal coil consumption for efficient DC control operation.
- Faston 250 quick-connect terminals for convenient electrical connections.
- Rear flange mounting for secure installation on suitable panels and chassis.
- 30 million operations mechanical endurance under specified conditions.
- Non-latching operation returns both contacts to their normal states when coil power is removed.
- Wide operating temperature range for demanding industrial environments.
- Suitable for machinery, industrial automation, electrical control and equipment maintenance.
Key Features
- Finder 65 Series industrial power relay.
- 20 A rated contact current.
- 48 V DC nominal coil voltage.
- One normally open and one normally closed contact.
- Two separate single-throw contact circuits.
- 250 V AC rated contact voltage.
- 400 V AC maximum switching voltage.
- 5,000 VA rated resistive load (AC1).
- 1,000 VA rated AC15 load.
- Silver tin oxide (AgSnO₂) contact material.
- 1.3 W nominal DC coil consumption.
- Approximately 27.1 mA nominal coil current.
- Approximately 1.77 kΩ nominal coil resistance.
- Faston 250 terminals measuring 6.3 × 0.8 mm.
- Rear flange mounting arrangement.
- Six electrical terminals for the coil and two contact circuits.
- 30 million operations mechanical endurance.
- 80,000 operations electrical endurance at the specified rated load.
- RT I environmental protection category.
- Non-latching DC coil operation.
Reliable 20 A Switching for 48 V DC Industrial Control Systems
The Finder 65.31.9.048.4000 operates as an electrically controlled switching device. When its 48 V DC coil is energised, the normally open contact closes and the normally closed contact opens. When the coil supply is removed, both contacts return to their original positions.
This 1 NO + 1 NC configuration is particularly useful where one circuit must be activated while another is deactivated. Applications include auxiliary equipment control, electrical signalling, machinery control and complementary switching arrangements. Unlike a conventional changeover contact, the relay's normally open and normally closed contacts are independently wired and do not share a common terminal.
The relay's silver tin oxide contacts support repeated switching of compatible electrical loads. Its 20 A rated contact current and 5,000 VA AC1 resistive switching capacity make it suitable for appropriately rated industrial power circuits. The permissible current must always be assessed against the actual load type, voltage and switching conditions.
For installation, the rear flange mounting arrangement provides secure attachment to a suitable chassis or panel, while the Faston 250 terminals allow convenient electrical connections using compatible receptacles. Its 48 V DC coil is particularly relevant to industrial control systems using this nominal DC supply voltage.
Typical Applications
- Industrial automation and electrical control panels.
- 48 V DC control circuits.
- Industrial machinery and manufacturing equipment.
- Electrical load switching and auxiliary equipment control.
- Complementary normally open and normally closed switching circuits.
- Industrial heating and temperature control equipment.
- Commercial and industrial lighting control.
- Electrical signalling and equipment status circuits.
- Conveyor systems and material handling equipment.
- Industrial process control systems.
- Ventilation and HVAC equipment control.
- Electrical power management and distribution equipment.
- Maintenance and replacement of compatible industrial relays.
- Applications requiring a 48 V DC coil and 20 A 1 NO + 1 NC contacts.
Technical Specifications
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| Device Type | Power Relay | |
|---|---|---|
| Terminal Type | Faston / flat-pin | |
| Switching Current (A) | 20 A | |
| Load Voltage | 400 V AC | |
| Mounting Type | Panel | |
| Manufacturer | Finder | |
| Series | 65 Series Power Relays | |
| Model | 65.31.9.048.4000 | |
| Product type | Industrial electromechanical power relay | |
| Contact configuration | 1 NO + 1 NC | |
| Normally open contacts | 1 | |
| Normally closed contacts | 1 | |
| Contact arrangement | Two independently wired single-throw contacts | |
| Rated contact current | 20 A | |
| Maximum peak contact current | 40 A for 10 ms under specified conditions | |
| Rated contact voltage | 250 V AC | |
| Maximum switching voltage | 400 V AC | |
| Rated resistive load (AC1) | 5,000 VA | |
| Rated inductive load (AC15) | 1,000 VA | |
| Single-phase motor rating at 230 V AC | 1.1 kW | |
| DC1 breaking capacity at 30 V DC | 20 A | |
| DC1 breaking capacity at 110 V DC | 0.8 A | |
| DC1 breaking capacity at 220 V DC | 0.5 A | |
| Nominal coil voltage | 48 V DC | |
| Coil type | DC, non-latching | |
| Nominal coil consumption | 1.3 W | |
| Nominal coil current | Approximately 27.1 mA | |
| Nominal coil resistance | Approximately 1,770 Ω | |
| Coil operating voltage range | 40.8 to 52.8 V DC under specified reference conditions | |
| Contact material | Silver tin oxide (AgSnO₂) | |
| Mounting type | Chassis / panel mounting | |
| Mounting arrangement | Rear flange | |
| Terminal type | Faston 250 quick-connect | |
| Terminal dimensions | 6.3 × 0.8 mm | |
| Number of electrical terminals | 6 | |
| Approximate overall dimensions | 36.5 × 32.2 × 59.2 mm | |
| Operating temperature | −40 to +75 °C | |
| Mechanical endurance | 30 million operations | |
| Electrical endurance | 80,000 operations at the specified rated load | |
| Operating time | Approximately 10 ms | |
| Release time | Approximately 12 ms | |
| Coil-to-contact dielectric strength | 4,000 V | |
| Dielectric strength between open contacts | 1,500 V AC | |
| Environmental protection category | RT I | |
| Application | Industrial automation, electrical control and load switching |
Frequently Asked Questions
What is the Finder 65.31.9.048.4000 used for?
The Finder 65.31.9.048.4000 is a 20 A industrial power relay used for switching electrical loads in machinery, automation systems and control panels. It operates one normally open and one normally closed contact using a 48 V DC coil.
What is the coil voltage of the Finder 65.31.9.048.4000?
The relay has a 48 V DC nominal coil voltage. Its nominal coil consumption is 1.3 W, with a nominal coil current of approximately 27.1 mA and a coil resistance of approximately 1.77 kΩ.
What is the operating voltage range of the 48 V DC coil?
The specified operating voltage range is approximately 40.8 to 52.8 V DC under the manufacturer's reference conditions. Actual operating limits can depend on ambient temperature and installation conditions.
What is the contact rating of this relay?
The Finder 65.31.9.048.4000 has a 20 A rated contact current at 250 V AC, with a rated resistive switching capacity of 5,000 VA. The permissible switching load depends on the electrical load characteristics and applicable switching category.
How many contacts does the Finder 65.31.9.048.4000 have?
The relay has two separate contacts: one normally open (NO) and one normally closed (NC). When the coil is energised, the NO contact closes while the NC contact opens. Both return to their normal states when coil power is removed.
Is the Finder 65.31.9.048.4000 a changeover relay?
No. The relay has two independently wired single-throw contacts, one normally open and one normally closed. A conventional changeover contact uses a shared common terminal, whereas this model provides two separate switching circuits.
How is the Finder 65.31.9.048.4000 mounted?
The relay uses a rear flange mounting arrangement for installation on a compatible panel or chassis. Electrical connections are made using Faston 250 quick-connect terminals measuring 6.3 × 0.8 mm.
What contact material is used in this relay?
The Finder 65.31.9.048.4000 uses silver tin oxide (AgSnO₂) contacts. This cadmium-free contact material is suitable for reliable switching of compatible industrial electrical loads.
What is the expected service life of the Finder 65.31.9.048.4000?
The relay has a specified mechanical endurance of 30 million operations and an electrical endurance of 80,000 operations at the specified rated load. Actual service life depends on switching frequency, electrical loading and environmental conditions.
What is the difference between the Finder 65.31.9.048.4000 and 65.31.9.048.4300?
The main difference is the contact arrangement and current rating. The 65.31.9.048.4000 has one normally open and one normally closed contact rated at 20 A, while the 65.31.9.048.4300 has one normally open contact rated at 30 A. Both use a 48 V DC coil, but their switching functions and contact ratings differ.
Can the Finder 65.31.9.048.4000 switch DC loads?
Yes. The relay can switch compatible DC loads. Published Finder 65.31 specifications include DC1 breaking capacities of 20 A at 30 V DC, 0.8 A at 110 V DC and 0.5 A at 220 V DC. Higher-voltage and inductive DC loads require careful assessment against the manufacturer's breaking-capacity specifications.
Trusted by Industrial Automation Professionals Worldwide
Finder 65 Series power relays are designed for demanding industrial automation, machinery and electrical control applications. The Finder 65.31.9.048.4000 combines a 20 A contact rating, 48 V DC operating coil, one normally open and one normally closed contact, silver tin oxide contact material, Faston 250 terminals and rear flange mounting to provide a versatile switching solution for compatible industrial equipment.
