Why Choose the Pizzato FD 21R2-L20F1M2 Safety Switch with Manual Mechanical Delay?
The Pizzato FD 21R2-L20F1M2 is an FD series safety switch with manual mechanical delay designed for monitoring guards and access points on industrial machinery. Its manually operated delayed-release mechanism is particularly useful where access to a protected area should not occur immediately after the machine safety circuit has been interrupted.
This configuration combines a robust metal housing with a 3NC slow-action contact block and a manual mechanical delay head incorporating a long 20-second knob. The delayed operating sequence provides a mechanical waiting period before the actuator can be released, making the switch suitable for machinery where hazardous movement may require time to stop after a shutdown command.
The FD 21R2-L20F1M2 uses a bent actuator, an M20 × 1.5 threaded cable entry and provides IP67 protection according to EN 60529. These characteristics make it a practical safety-switching solution for industrial guards where rugged construction, positive-opening safety contacts and manually controlled delayed access are required.
Key Advantages
- Manual mechanical delay helps prevent immediate access to hazardous machine areas.
- 20-second delayed-release mechanism provides a defined mechanical waiting period.
- 3NC slow-action contacts support safety-related guard monitoring circuits.
- Robust metal housing for demanding industrial environments.
- Bent actuator provides a practical solution for compatible guard arrangements.
- Positive-opening safety contacts support dependable guard monitoring.
- IP67 protection provides resistance to dust and temporary water immersion.
- Mechanical delay principle does not require an electrically powered guard-locking solenoid.
Key Features
- Pizzato FD series safety switch.
- Manual mechanical delay head.
- Long 20-second operating knob.
- 3NC slow-action contact block (B21).
- Bent separate actuator.
- Durable metal enclosure.
- One M20 × 1.5 threaded cable entry.
- IP67 protection according to EN 60529.
- No emergency release.
- No auxiliary release.
- No integrated status indicator.
- Designed for industrial machine guard monitoring and delayed access control.
Controlled Guard Access with a Manual Mechanical Delay
On machinery with moving components that may continue to present a hazard for a short period after the stop command, immediately opening a guard can create unnecessary risk. The Pizzato FD 21R2-L20F1M2 addresses this requirement through a manual mechanical delay mechanism that introduces an approximately 20-second operating period before guard access can be completed.
The switch combines this delayed-access function with three normally closed slow-action contacts and a separate bent actuator. When correctly integrated into a suitable machine safety circuit, the arrangement enables the guard position to be monitored while the mechanical delay provides additional time for residual machine movement to cease before access.
Typical Applications
- Industrial machinery with hazardous run-down time.
- Rotating machinery and equipment with residual movement.
- Machine guard doors requiring delayed access.
- Packaging and processing machinery.
- Automated manufacturing and assembly equipment.
- Guarded production cells and industrial automation systems.
- OEM machinery requiring mechanically delayed guard access.
