GuardSwitch Series 300
Safety Interlock Switch 301-BT
Caution: When used without a Sentrol INT 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 for use with tungsten filament loads because of high
current inrush surges. Line capacitance and load capacitance must be
considered.
Installation Sheet
Description
The GuardSwitch Series 300 Safety Interlock Switch 301-BT is
designed for use with safety monitored relays or monitored circuits. To
achieve the optimum defeat resistant features of the switch, both the
switch circuit (Circuit 1) and the tamper circuit (Circuit 2) must be
connected. An optional third circuit can be provided to indicate at the
panel which guard is open.
Notes
• Environmental: Pollution Degree II.
• Correct use of this control device is an essential part of proper
machine cycle control.
• Failure to follow all instructions could lead to serious bodily injury
or death.
• Maintenance to be done by qualified personnel only.
• The connecting cables between the INT devices and the switches
must be located in an IP 23 type enclosure (minimum).
• The mounting for the switch and the actuator magnet must be
accomplished per this specification.
• Nonremovable hardware must be used for installation.
• The housing of the switch must be connected to the PE (primary
earth) ground circuit via a lock washer on the mounting screw. The
PE ground symbol must be placed adjacent to the screw.
To verify switch operation with an ohmmeter:
Set range at 20 MΩ (switches with triac output, set range at 20 kΩ).
For a normally open switch, the meter will read a high impedance with
the actuator away. It will read very high to infinity range (triac switches
will read high kΩ to infinity range) with the actuator within sense range.
You will see the opposite reading for a normally closed switch.
Excessive line capacitance can be caused by cable lengths over 50 ft.
when using a maximum 48 VAC. A resistor can be added in series to
limit the inrush current (at least 48 Ω for 24 V 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
Wattage = I² × R (I = maximum continuous current of the load)
To install the switch:
1. Position the switch and actuator so the labels are reading in the
same direction (see Figure 2).
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. See “Ordering
information” on page 4 for sense ranges. See Figure 3 for
recommended mounting configurations.
3. Mounting on a ferrous material will affect the sense range a
minimum of 50%. However, a 1/4 in. nonferrous spacer positioned
under the magnet and/or switch should restore most of the lost
sense range.
4. For best protection against operator defeat, mount with
nonremovable screws, bolts, or nuts. See ordering information for
details.
5. When mounting the switch on an ungrounded machine, ground the
switch housing by connecting your ground lead to one of the switch
mounting screws.
Figure 1: Dimensions
Installation
Use nonremovable screws, bolts, or nuts to mount the switch and
actuator. Do not over-torque mounting hardware. See Figure 1 for
dimensions.
P/N 13924 • REV F • ISS 09SEP15 1 / 4
Figure 2: Switch/actuator position
S1,
S2, S3
S4
NO
NC
NO
Circuits*
without LED
Circuits*
with optional LED
S1
S2
S3
S5
BLK
D1
Optional LED
WHT (or YLW)
ORG
BRN
RED
CIR. 3
CIR. 2
D2
S5
CIR. 2
S1
S2
S3
S4
S4
BLK
ORG
BRN
RED
CIR. 3
CIR. 1
WHT (or YLW)
BLUE (or GRN)
CIR. 1
BLUE (or GRN)
Figure 3: Mounting configurations
Figure 4: Circuits
*Circuits shown with magnet actuator away from switch.
S5 Normally open reed switch, closed when
actuator is within 0.6"
Normally open reed switches, will close if
misaligned or tampered with a standard
magnet
Biased closed reed switch, open when
actuator is between 0.3" and 0.6"
circuit Black, white, or yellow wires.
biased tamper circuit Red, blue, or green wires.
monitor circuit Orange and brown wires.
Note: For white and blue colors, see the optional color codes shown in
Figure 4.
Figure 5: Wiring for category 3
Note: For white and blue colors, see the optional color codes shown in Figure 4.
2 / 4 P/N 13924 • REV F • ISS 09SEP15
Figure 6: Wiring for category 4
Enclosure
Temperature
range
Environmental
encapsulated
NEMA rating
Protection class
Response time
Individual circuits
per second and a
Life cycles
Lead types/O.D.
Part number
1953
1954
1955
1956
Circuit number
Circuit type
Contact configuration
Load rating
Switching voltage
Switching current
1
2
2
3
Note: For white and blue colors, see the optional color codes shown in Figure 4.
Specifications
General specifications
304 folded stainless steel
−40°F to 180°F (−40°C to 80°C)
Hermetically sealed contact switch,
in polyurethane
1, 2, 4, 4X, 5, 12, 12K
IP 66
1 msec (5.4 VA); 10 msec (150 VA)
The two circuits do not switch simultaneously,
and depend on the speed of the guard closure.
Based on closure speed of 1 ft.
gap of 1/8 in., a delay less than 50 msec is
typical.
100,000 under full load
Up to 200,000,000 under dry circuit
18/4 SJTOW (K) / 0.34 in. (0.86 cm)
22/4 PVC Jacketed (J) / 0.19 in. (0.48 cm)
22/6 PVC Jacketed (J) / 0.21 in. (0.53 cm)
Accessories
Tamper proof screws and screwdriver
#6 x 3/4 in. L Tampruf Roundhead Screw
#8 x 1-1/2 in. L Tampruf Roundhead Screw
Tampruf Screwdriver
Tampruf 1/4 in. Drive Bit for #6 and #8 screws
Electrical specifications [1]
Switch: S1 NO 40 W/VA 48 VAC/VDC 1.0 A DC, 0.7 AAC
Tamper: S2, S3, S4 NC 10 W/VA 48 VAC/VDC 0.2 A
With optional LED: D1 NC 0.1 to 1.4 W 48 VDC(3 V drop) 30 mA
Monitor: S5 NO 10 W/VA 48 VAC/VDC 0.3 ADC, 0.3 AAC
[1] IMPORTANT: Each electrical rating is an individual maximum and cannot be exceeded.
P/N 13924 • REV F • ISS 09SEP15 3 / 4
Ordering information
Part number
minimum [3]
maximum [3]
nominal
301
301
301
301
301
301
301
301
301
301
301
301
301
301
[
[
[
and type of material cause a wide diversity of effects.
Testing is required to determine actual sense r
[4] The NH version does not have a minimum sense range.
Model number
301
301
301
301
301
301
301
301
301
301
301
301
301
301
301
UL file number
CSA file number
[1] Contact configuration [2] Sense range
-BT-06(J)(K) DPST: 1 NO, 1 NC 0.3 in. (0.8 cm) 0.6 in. (1.5 cm) 1.2 in. (3.0 cm) 6 ft. (1.8 m)
-BT-SPNHJ6 [4] DPST: 1 NO, 1 NC 0.6 in. (1.5 cm) 1.2 in. (3.0 cm) 6 ft. (1.8 m)
-BT-12(J)(K) DPST: 1 NO, 1 NC 0.3 in. (0.8 cm) 0.6 in. (1.5 cm) 1.2 in. (3.0 cm) 12 ft. (3.6 m)
-BT-SPNHJ12 [4] DPST: 1 NO, 1 NC 0.6 in. (1.5 cm) 1.2 in. (3.0 cm) 12 ft. (3.6 m)
-BT-SPNHJ15 [4] DPST: 1 NO, 1 NC 0.6 in. (1.5 cm) 1.2 in. (3.0 cm) 15 ft. (4.6 m)
-BT-SPNHJ25 [4] DPST: 1 NO, 1 NC 0.6 in. (1.5 cm) 1.2 in. (3.0 cm) 25 ft. (7.5 m)
-BLT-06(J)(K) DPST: 1 NO, 1 NC w/LED 0.3 in. (0.8 cm) 0.6 in. (1.5 cm) 1.2 in. (3.0 cm) 6 ft. (1.8 m)
-BLT-12(J)(K) DPST: 1 NO, 1 NC w/LED 0.3 in. (0.8 cm) 0.6 in. (1.5 cm) 1.2 in. (3.0 cm) 12 ft. (3.6 m)
-B3T-06J TPST: 2 NO, 1 NC 0.3 in. (0.8 cm) 0.6 in. (1.5 cm) 1.2 in. (3.0 cm) 6 ft. (1.8 m)
-B3T-12J TPST: 2 NO, 1 NC 0.3 in. (0.8 cm) 0.6 in. (1.5 cm) 1.2 in. (3.0 cm) 12 ft. (3.6 m)
-B3T-20J TPST: 2 NO, 1 NC 0.3 in. (0.8 cm) 0.6 in. (1.5 cm) 1.2 in. (3.0 cm) 20 ft. (6.1 m)
-B3T-SPNHJ12 [4] TPST: 2 NO, 1 NC 0.6 in. (1.5 cm) 1.2 in. (3.0 cm) 12 ft. (3.6 m)
-B3T-SPNHJ25 [4] TPST: 2 NO, 1 NC 0.6 in. (1.5 cm) 1.2 in. (3.0 cm) 25 ft. (7.5 m)
-B3LT-12(J)(K) TPST: 2 NO, 1 NC w/LED 0.3 in. (0.8 cm) 0.6 in. (1.5 cm) 1.2 in. (3.0 cm) 12 ft. (3.6 m)
1] For all 301 models, the cable exits from the left side.
2] Configuration with actuator away from the switch.
3] Proximity of ferrous materials usually reduces sense range — typically by 50%. The shape
ange for specific applications.
Sense range
Break range Lead length
Regulatory information
UL CSA
-BT-06(J)(K) X X
-BT-SPNHJ6
-BT-12(J)(K) X X
-BT-SPNHJ12
-BT-SPNHJ15
-BT-20J X X
-BT-SPNHJ25
-BLT-06(J)(K) X X
-BLT-12(J)(K) X X
-B3T-06J X
-B3T-12J X
-B3T-20J X
-B3T-SPNHJ12
-B3T-SPNHJ25
-B3LT-12(J)(K) X
E122942
089176
4 / 4 P/N 13924 • REV F • ISS 09SEP15
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