Allen-Bradley 440N-Z Sensa-Guard non-contact switch with magnetic integrated latch

The Allen-Bradley 440N-Z SensaGuard non-contact switch with a magnetic integrated latch combines a non-contact interlock switch and door latch into one integrated solution. It can be used to replace separately mounting an interlock switch and door catch in lightweight guard doors.

The switch has RFID technology for coding, inductive technology for sensing and output switching signal device (OSSD) safety outputs. It is available with a coded sensor and actuator to help protect against operators or maintenance personnel defeating the switch, helping to improve safety.

The switch is suitable for machines where multiple access doors must be monitored up to PLe, SIL 3, Cat 4. It does not require a dedicated safety controller for its RFID coding security and so can be connected to a range of standard safety controllers such as Allen-Bradley Guardmaster safety relays, SmartGuard 600 and Safety I/O Blocks.

Multiple actuator sizes from 15 to 25 mm allow for a large sensing distance. Both plastic and stainless steel versions carry an IP69K rating and come with electronic short-circuit and overvoltage protection built in.

The switch’s PLe, SIL 3, Cat 4 rating is maintained even when multiple units are connected in series. LED indicators give a visual indication of door status, can indicate door misalignment and offer diagnostics to help identify faults.

The switch can be connected in series with other devices such as light curtains, e-stops and interlock switches. For increased security, a switch’s RFID tag can be individually coded to an actuator so no other actuator can be used with it.