Safety door switch with key SG-B2

• Regardless of door types, do not use the safety switch as a door stop. Install a mechanical door stop at the end of the door to protect the safety switch against excessive force.
• Do not apply excessive shock to the safety switch when opening or closing the door. A shock to the safety switch exceeding 1,000 m/s² may cause damage to the safety switch.
• If the operating atmosphere is contaminated, use a protective cover to prevent the entry of foreign objects into the safety switch through the actuator entry slots. Entry of a considerable amount of foreign objects into the safety switch may affect the mechanism of the safety switch and cause a malfunction.
• Cover the unused actuator entry slot using the slot plug supplied with the safety switch.
• Do not store the safety switches in a dusty, humid, or organic-gas atmosphere, or in an area subjected to direct sunlight.
• Use proprietary actuators only. When other actuators are used, the safety switch may be damaged.
  Do not cut, machine, or otherwise modify actuators. Doing so may cause equipment failure.
• Do not open the lid of the safety switch. Loosening the screws may damage the safety switch.
• The locking strength is rated at 1,400 N. Do not apply a load higher than the rated value. When a higher load is expected, provide an additional system consisting of another safety switch without lock or a sensor to detect door opening and stop the machine.
• Regardless of door types, do not use the safety switch as a door lock. Install a separate lock using a latch or other measures.
• Although the SG-K21A / SG-K22A actuators alleviate the shock when the actuator enters the slot on the safety switch, make sure that excessive shock is not applied. If the rubber bushings become deformed or cracked, replace with new ones.
• Do not mount the safety switch facing down as shown in the figure below. Otherwise, the key may fall off due to shock.

When using the safety switch on hinged doors, refer to the minimum radius of doors shown below. When using on doors with small minimum radius, use the angle adjustable actuator (SG-K24).

Note:	Because deviation or dislocation of hinged doors may occur in actual applications, make sure of the correct operation before installation.

When using the right-angle actuator (SG-K22) <When the door hinge is on the extension line of the actuator mounting surface>

<When the door hinge is on the extension line of the safety switch surface>

When using the right-angle actuator (with rubber bushings) (SG-K22A) <When the door hinge is on the extension line of the actuator mounting surface>

<When the door hinge is on the extension line of the safety switch surface>

Actuator angle adjustment (vertical / horizontal)

• Using the angle adjustment screw (M3 hexagon-socket-head screw), the actuator angle can be adjusted. (refer to the dimensions)
  Adjustable angle: 0 to 20°
• The larger the adjusted angle of the actuator, the smaller the applicable radius of the door opening. After installing the actuator, open the door. Then adjust the actuator so that its edge can be inserted properly into the actuator entry slot of the safety switch.
• After adjusting the actuator angle, apply Loctite to the adjustment screw so that the screw will not move.

When using the angle adjustable actuator (SG-K24)

• When the door hinge is on the extension line of the actuator mounting surface: 70 mm 2.756 in
• When the door hinge is on the extension line of the safety switch surface: 50 mm 1.969 in

<When the door hinge is on the extension line of the actuator mounting surface>

<When the door hinge is on the extension line of the safety switch surface>

• Mount the safety switch on a fixed piece of machinery or guard and the actuator on a hinged door.
  Avoid mounting both the safety switch and actuator on a hinged door. Doing so may cause equipment failure. For more information about how to mount the devices, see the following diagram:

・Recommended screw tightening torque

Notes:

1)	The above recommended tightening torques of the mounting screws are the values confirmed with hexagon-socket-head bolts. When other screws are used and tightened to a smaller torque, make sure that the screws do not come loose after mounting.
2)	In the case of SG-K21A or SG-K22A, using two M4 screws and two attached washers, fasten the actuator securely on the door.