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KBF4L21 – ADJ RUBBER ROLLER LEVER 2NO+1NC SLOW
Lovato KBF4L21 is an IP65 thermoplastic limit switch with an adjustable rubber roller lever, 2NO+1NC slow-action contacts and a bottom M20 cable entry.
£38.21
Why Choose the Lovato KBF4L21 Limit Switch?
The Lovato KBF4L21 is an industrial K series limit switch with an adjustable roller lever, designed for position detection and motion monitoring in machinery and automated equipment. Its dimensions conform to EN 50047, supporting straightforward integration into standard industrial installations.
This limit switch features 2NO+1NC slow-action contacts, providing two normally open contacts and one normally closed contact for machine control, monitoring and sequencing. The adjustable lever incorporates a rubber roller with offset alignment, allowing the actuator position to be adapted to the movement and geometry of the machine.
The KBF4L21 uses a double-insulated thermoplastic housing with IP65 body protection and a bottom M20 cable entry. Its three-contact configuration, self-releasing screw terminals and adjustable operating head make it suitable for versatile mechanical position detection in demanding industrial applications.
Key Advantages
- Adjustable roller-lever limit switch for industrial machinery.
- 2NO+1NC slow-action contacts support control, monitoring and signalling.
- Rubber roller with offset alignment for adaptable mechanical actuation.
- IP65 thermoplastic housing provides protection against dust and water jets.
- EN 50047 dimensions simplify installation and replacement.
- Bottom M20 cable entry supports convenient machine wiring.
Key Features
- Lovato K series industrial limit switch.
- Adjustable roller-lever actuator.
- Rubber roller with offset alignment.
- 2 normally open and 1 normally closed contact.
- Slow-action contact operation.
- Double-insulated polymer thermoplastic housing.
- Locking bayonet operating-head insert.
- Self-releasing screw terminals.
- M20 bottom cable entry.
Reliable Position Detection for Industrial Machinery
Limit switches convert the physical movement of a machine component into an electrical contact signal. The adjustable lever on the Lovato KBF4L21 allows the roller position to be configured for contact with cams, conveyors and other moving parts, while the rubber roller provides a resilient actuation surface.
Its slow-action mechanism changes the two normally open contacts and one normally closed contact according to actuator travel. This three-contact arrangement enables multiple control or signalling functions to be operated from a single mechanical position switch.
Typical Applications
- Machine position and end-of-travel detection.
- Conveyors and material-handling systems.
- Automated sequencing and status monitoring.
- Packaging and processing machinery.
- Automated production and assembly equipment.
- Cams, lifts and moving mechanical components.
Technical Specifications
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| Device Type | Limit switch | |
|---|---|---|
| Switching Action | Slow action | |
| Contacts | 2NO + 1NC | |
| Actuator Type | Roller lever | |
| Housing Material | Plastic | |
| Connection | M20 cable entry | |
| HS Code | 85365080 | |
| Manufacturer | Lovato Electric | |
| Series | K | |
| Model | KBF4L21 | |
| Product type | Industrial limit switch | |
| Actuator | Adjustable roller lever | |
| Roller material | Rubber | |
| Roller configuration | Offset alignment | |
| Contact configuration | 2NO+1NC | |
| Contact action | Slow action | |
| Thermal current | 10 A | |
| IEC/EN 60947-5-1 designation | A600 / Q600 | |
| Rated insulation voltage | 690 V | |
| Rated impulse withstand voltage | 6 kV | |
| Insulation class | Class II | |
| Average resistance per pole | Less than 10 mΩ | |
| Switching speed | 0.5–1.5 m/s | |
| Operating torque | 3 Ncm | |
| Cable connection | Self-releasing screw terminals | |
| Conductor capacity | 1.5–2.5 mm² | |
| Cable entry | M20, bottom entry | |
| Housing material | Polymer thermoplastic | |
| Housing protection rating | IP65 | |
| Terminal protection rating | IP20 | |
| Operating temperature | -25 °C to +70 °C | |
| Storage temperature | -40 °C to +70 °C | |
| Maximum operating frequency | 3,600 cycles/hour | |
| Pollution degree | 3 | |
| Weight | 158 g | |
| Dimensional standard | EN 50047 |
Frequently Asked Questions
What is the Lovato KBF4L21 used for?
The KBF4L21 detects the position or movement of components in industrial machinery and changes the state of its three electrical contacts.
What type of actuator does the KBF4L21 have?
It has an adjustable roller lever with a rubber roller and offset alignment for adaptable mechanical actuation.
What contacts are included?
The switch has 2NO+1NC slow-action contacts, comprising two normally open contacts and one normally closed contact.
What cable entry does the KBF4L21 use?
The KBF4L21 has one bottom M20 cable entry and self-releasing screw terminals for conductor connection.
What environmental protection does the switch provide?
The thermoplastic body housing provides IP65 protection, while the terminals are rated IP20.
Trusted Industrial Control from Lovato Electric
Lovato Electric K series limit switches provide adaptable and reliable position detection through standardised dimensions, durable industrial housings and a wide selection of actuator and contact configurations.
