GuardSwitch Series 300
Switches 301-BT and 303-BT Installation Sheet
Figure 1: Dimensions
Description
The 301-BT Series 300 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 301-BT, 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.
• Non-removable hardware must be used for installation.
• The housing of the 300-BT 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 mega ohms (switches with triac output, set
ohm range at 20 kilo ohms). 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 kilo
ohm to infinity range) with the actuator within sense range. You
will see the opposite reading for a normally closed switch.
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 (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.) 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" non-ferrous 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
non-removable screws, bolts or nuts. See ordering
information for details.
© 2013 UTC Fire & Security. All rights reserved. 1 / 6 P/N 13924 • REV D • REB 27FEB13
Caution: When not used with 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 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
24 Volt 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 = I2•R (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.
Figure 2: Switch/Actuator position
Figure 4: Circuits
*Circuits shown with magnet actuator away from switch.
S1,S5 Normally open reed switch, closed when actuator is within
0.6"
S2, S3 Normally open reed switches, will close if misaligned or
tampered with a standard magnet
S4 Biased closed reed switch, open when actuator is between
0.3" and 0.6"
N.O. circuit: Black and white wires.
N.C. biased tamper circuit: Red and blue wires.
N.O. monitor circuit: Orange and brown wires.
Figure 3: Mounting configurations
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Figure 5: Wiring for category 3
Figure 6: Wiring for category 4
P/N 13924 • REV D • REB 27FEB13 3 / 6
Specifications
General specifications
Enclosure 304 folded stainless steel
Temperature range -40°F to 180°F (-40°C to 80°C)
Environmental Hermetically sealed contact switch
Encapsulated in polyurethane
NEMA rating 1, 2, 4, 4X, 5, 12, 12K
Protection class IP 66
Response time 1 msec (5.4VA); 10 msec (150VA)
Individual circuits The two circuits do not switch simultaneously,
Life cycles 100,000 under full load;
Lead types/O.D. 18/4 SJTOW (K)/0.34" (0.86cm)
UL/CSA All models except 301-BT-SPNH
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.
Up to 200,000,000 under dry circuit
22/4 PVC Jacketed (J)/0.19" (0.48cm)
22/6 PVC Jacketed (J)/0.21" (0.53cm)
Electrical specifications
Circuit number Circuit type Contact configuration Load rating Switching voltage Switching current
1 Switch: S1 N.O. 40W/VA 48VAC/VDC 1.0ADC, 0.7AAC
2 Tamper: S2, S3, S4 N.C. 10W/VA 48VAC/VDC 0.3A
2 With optional LED: D1 N.C. 0.1 to 1.4W 48VDC(3V drop) 30mA
3 Monitor: S5 N.O. 10W/VA 48VAC/VDC 0.3ADC, 0.3AAC
Ordering information
Part number Contact configuration Sense range minimum Sense range maximum Break range Lead length nominal
301-BT-06(J)(K) DPST: 1 N.O., 1 N.C. 0.3"(0.8cm) 0.6"(1.5cm) 1.2"(3.0cm) 6' (1.8m)
301-BT-SPNHJ6 DPST: 1 N.O., 1 N.C. 0.6"(1.5cm) 1.2"(3.0cm) 6' (1.8m)
301-BT-12(J)(K) DPST: 1 N.O., 1 N.C. 0.3"(0.8cm) 0.6"(1.5cm) 1.2"(3.0cm) 12' (3.6m)
301-BT-SPNHJ12 DPST: 1 N.O., 1 N.C. 0.6"(1.5cm) 1.2"(3.0cm) 12' (3.6m)
301-BT-SPNHJ15 DPST: 1 N.O., 1 N.C. 0.6"(1.5cm) 1.2"(3.0cm) 15' (4.6m)
301-BT-20J DPST: 1 N.O., 1 N.C. 0.3"(0.8cm) 0.6"(1.5cm) 1.2"(3.0cm) 20' (6.1m)
301-BT-SPNHJ25 DPST: 1 N.O., 1 N.C. 0.6"(1.5cm) 1.2"(3.0cm) 25' (7.5m)
301-BLT-06(J)(K) DPST: 1 N.O., 1 N.C. w/LED 0.3"(0.8cm) 0.6"(1.5cm) 1.2"(3.0cm) 6' (1.8m)
301-BLT-12(J)(K) DPST: 1 N.O., 1 N.C. w/LED 0.3"(0.8cm) 0.6"(1.5cm) 1.2"(3.0cm) 12' (3.6m)
301-B3T-06J TPST: 2 N.O., 1 N.C. 0.3"(0.8cm) 0.6"(1.5cm) 1.2"(3.0cm) 6' (1.8m)
301-B3T-12J TPST: 2 N.O., 1 N.C. 0.3"(0.8cm) 0.6"(1.5cm) 1.2"(3.0cm) 12' (3.6m)
301-B3T-20J TPST: 2 N.O., 1 N.C. 0.3"(0.8cm) 0.6"(1.5cm) 1.2"(3.0cm) 20' (6.1m)
301-B3T-SPNHJ12 TPST: 2 N.O., 1 N.C. 0.6"(1.5cm) 1.2"(3.0cm) 12' (3.6m)
301-B3T-SPNHJ25 TPST: 2 N.O., 1 N.C. 0.6"(1.5cm) 1.2"(3.0cm) 25' (7.5m)
301-B3LT-12(J)(K) TPST: 2 N.O., 1 N.C. w/LED 0.3"(0.8cm) 0.6"(1.5cm) 1.2"(3.0cm) 12' (3.6m)
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Warning: Each electrical rating is an individual maximum and cannot be exceeded!
1 The part numbers 301 and 303 are the same in all respects except the cable exits, 301 left and 303 right. Not all models are available in 303.
2 Configuration with actuator away from the switch
3 Proximity of ferrous materials usually reduces sense range — typically by 50%. The shape and type of material cause a wide diversity of
effects. Testing is required to determine actual sense range for specific applications.
4 The NH version does not have a minimum sense range.
Accessories
Part number Tamper proof screws and screwdriver
1953 #6 x 3/4"L Tampruf Roundhead Screw
1954 #8 x 1-1/2"L Tampruf Roundhead Screw
1955 Tampruf Screwdriver
1956 Tampruf 1/4" Drive Bit for #6 and #8 screws
Regulatory information
European
directives
Specific
European
standards
Certification
Machinery Directive (89/392/EEC)
EMC Directive (89/336/EEC)
Low Voltage Directive (73/23/EEC)
EN60204-1 Safety of electrical equipment of
industrial machines
EN292 Part 1, 2 Safety of Machinery, basic
terminology, technical principles
EN954-1 Risk Assessment Category 3 or 4
depending on wiring method, see diagrams
EN55081-2 Electromagnetic Emissions
EN50082-2 Electromagnetic Immunity
EN1088 Interlocking Devices
EN947-5-3 Control Circuit Devices
EN50178 Safety of Electrical Equipment
IEC 664-1 Insulation requirements
IEC 68, part 2-1, 2-2, 2-3, 2-8, 2-14, 2-27, 2-30
Contact information
For contact information, see www.edwardssignaling.com.
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