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The 371-BT Series DPST safety interlock switch is designed for use with safety monitored relays or monitored circuits. To achieve the optimum Series 300 defeat resistant feature of the 371-BT, both the switch circuit (Circuit 1) and the tamper circuit (Circuit 2) must be connected.
Installation:
Use non-removable screws, bolts, or nuts to mount the switch and actuator. Do not over-torque mounting hardware.
1. Position the switch and actuator so the labels are reading in the same direction.
2. Mount the switch on the stationary frame of the machine and mount the actuator on the moveable guard, door or gate. Keep the switch and actuator within the listed sense range.
3. Mounting on a ferrous material will effect the sense range a minimum of 50%. However, a 1/4" non-ferrous spacer positioned under the actuator and/or switch should restore most of the lost sense range.
4. For best protection against operator defeat, mount with non-removable screws, bolts or nuts (see Accessories).
5. Caution! When not used with a GE INT safety relay, particular care must be taken to determine the actual load of the switch circuit. High voltage transients from coils, motors, contactors, and solenoids must be considered. Transient protection, such as back-to-back zener diodes (TransZorb) or an RC network, is recommended for such loads to ensure that maximum ratings of the switch are not exceeded. Not recommended to be used with tungsten filament loads because of high current inrush surges. Line capacitance and load capacitance must be considered. Excessive line capacitance can be caused by cable lengths over 50' when using a maximum 48 VAC. A resistor can be added in series to limit the inrush current (at least 48 Ohms for 24V applications). The resistor can be added in series just before the load. The voltage drop and the power rating of the resistor must be considered. Voltage drop = I•R; Watts = I2R (I = maximum continuous current of the load).
6. When mounting the switch on an ungrounded machine, ground the switch housing by connecting your ground lead to one of the switch mounting screws.
Specifications:
Enclosure: UL Explosion Proof, Die Cast Anodized Aluminum
UL Enclosure Classified for Use in Hazerdous Locations: Class I, Group B, C, D, Class II, Group E, F, G, Class III, Divisions 1 & 2
Temperature Range: -40°F to 180°F (-40°C to 80°C)
Environmental: Hermetically Sealed Contact Switch, Encapsulated in Polyurethane
NEMA Rating: 1, 2, 5
Protection Class: IP 64
Response Time: 1 msec
Individual Circuits: The two circuits do not switch simultaneously, and depend on the speed of the guard closure. Based on closure speed
of 1' per second and a gap of 1/8", a delay less than 50 msec is typical.
Life Cycles: 100,000 Under Full Load; / Up to 200,000,000 Under Dry Circuit
Conduit Connection: 1/2" Threaded NPT
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Features
- 371 DPST
- Safety Interlock Switch
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