ATO Safety Interlock Switches. Purchase ATO Safety Interlock Switches direct from KM Parts USA.

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AT0
Safety Interlock Switches

The AT0 operating head can be turned manually in 90 degree stages to match the specified actuating surface and direction of operation. Care should be taken during mounting and operation that no foreign particles penetrate the entry point of the actuator element. For IP 65 protection use cable entry clamp.

AT0-xx-1-ZB
Complete Switch, Including Actuator Element

Contacts

Normally
Open

Normally
Closed

AT0-01-1-ZB

AT0-11-1-ZB

AT0-02-1-ZB

AT0-02-...FT-ZBZ
Personnel Protection

Door is opened	Positive opening N.C. 21-22 contact opens
Open door	The N.C. 21-22 contact is safely open, even where attempts are made to tamper using basic tools
Door is closed	The triple-coded actuator element re-closes the N.C. contact

AT0-xx-xxx-xFT-ZBZ/X Safety Interlock Switches with Mechanical Securing Actuator, Listed Below and Sold Separately
Contacts		Voltage	Spring-power activated interlock switch (power required to deactivate interlock) • with interlock monitoring and auxiliary release mechanism • monitoring of door position: continuous	Electro-magnet activated interlock switch (power required to activate interlock) • with interlock monitoring • monitoring of door position: continuous
Normally Open	Normally Closed	Voltage
1	1	24 V DC	AT0-11-24DFT-ZBZ/X	AT0-11-24DMT-ZBZ/X
-	2	24 V DC	AT0-02-24DFT-ZBZ/X	AT0-02-24DMT-ZBZ/X
1	1	120 V 50/60 Hz	AT0-11-120AFT-ZBZ/X	AT0-11-120AMT-ZBZ/X
-	2	120 V 50/60 Hz	AT0-02-120AFT-ZBZ/X	AT 0-02-120AMT-ZBZ/X
1	1	230 V 50/60 Hz	AT0-11-230AFT-ZBZ/X	AT0-11-230AMT-ZBZ/X
1	2	230 V 50/60 Hz	AT0-02-230AFT-ZBZ/X	AT0-02-230AMT-ZBZ/X

AT0..-ZBZ	Actuators for combination with the AT0...-ZBZ/X basic units
AT0..-ZBZ	G-ZBZ	W-ZBZ	F-ZBZ	FG-ZBZ	NG-ZBZ	NW-ZBZ

	Straight actuator for sliding doors	Angled actuator for swing doors ≥ 250 mm width	Angled flexible actuator for doors which do not close precisely	Straight flexible actuator for doors which do not close precisely	Straight actuator with overlap, with increased tolerance in the direction of closing	Angled actuator with overlap, with increased tolerance in the direction of closing
AT0-02-...FT-ZBZ Personnel Protection

Door closed and interlocked	Requires no power: interlock also remains active under power loss or wire breakage Interlocked door = safe state N.C. enabling contact 21-22 is closed and allows an operation e.g. machine run, to start
To release door (deactivate interlock)	Apply voltage to the coil (A1, A2), e.g. from a motion detector. The N.C. enabling contact 21-22 opens. The N.C. door monitoring contact 11-12 remains closed as long as the door remains closed.
Opening the door	Only possible once it is released. The N.C. door monitoring contact 11-12 opens to indicate the open door.
Door is open	Only possible once it is released. The N.C. door monitoring contact 11-12 opens to indicate the open door.
Re-closing the door	Both contacts are blocked open, even where attempts are made to tamper using basic tools
To interlock door	N.C. enabling contact 21-22. The N.C. door monitoring contact 11-12 re-closes. Remove voltage from coil: 1. Actuator is locked in. 2. The N.C. enabling contact 21-22 closes. The enabling contact can only close when the door is interlocked