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Safety Interlock Switches
TL4024
Safety Interlock Switch
with Guard Door Locking
High locking force of 1,500 N (337 lb.) locks guard door shut until machine is
safe to enter
IP67 (NEMA 6) enclosure withstands water washdown
Door and lock monitoring—the TL4024 has a total of 4 contacts: 2 N/C safety + 1
contact for door position monitoring + 1 contact for lock monitoring
Unlocking is possible with a back load on the door to satisfy the demands of high
cycle time applications
Narrow profile enables mounting to 2 in. square tubing or in applications with
space restrictions
Rotatable head—the rotatable head provides 8 actuator entry positions to satisfy
most installation requirements
Optional key release—this option on power-to-unlock models allows manual
unlocking of the guard door
Optional slide bolt with integral door handle aids installation on sliding and
swinging guard doors
Two LED (red/green) status indicators on the lid may be wired to suit the
application
A Rapid Delivery Product: Select models are available for shipment today or
within 3 to 5 days
Conforms to EN60947-5-1, EN1088,
EN ISO 13849-1
UL and C-UL listed
DGUV approved
Specifications
Electrical
Safety Contacts: 2 N/C
Auxiliary Contacts: 1 N/O + 1 N/C
1 N/O + 1 N/O
Switching Ability AC: 230 V – 4 A
DC: 24 V – 4 A
Safety Contact Material: Silver alloy with gold flash
Minimum Current: 12 V 10 mA, 24 V 1 mA
Solenoid Supply Voltage: 24 VAC/DC or 110 VAC (all -15% / +10%)
Solenoid Power: 8 W
Solenoid Rating: 100% duty
Mechanical
Mounting: Any position
Mounting Hardware: 4 x M5 screws (not supplied)
Min Operating Radius: Approximately 300 mm (12 in.) with 90-degree actuator
Max Holding Force: 1500 N (337 lb.)
Max Actuation Speed: 20 m/min.
Case Material: Anodized die-cast alloy
Actuator Material: Stainless steel
Wiring Entry: 3 x 0.5 in. NPT
Weight: 800 g (28 oz.)
Color: Red
Mechanical Life: 1 x 106 minimum
Environmental
Protection: IP67 (NEMA 6)
Operating Temperature: -20 to 80°C (-4 to 176°F)
Cleaning: Water washdown
Compliance
Standards: EN60947-5-1, EN1088, EN ISO 13849-1, EN ISO14119
Approvals/Listings: CE marked for all applicable directives, UL and C-UL, DGUV
R
C US
Specifications are subject to
change without notice.
Note: The safety contacts of the STI
switches are described as normally
closed (N/C)—
i.e., with the guard closed, actuator
in place, and the machine able to
be started.
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TL4024 Safety Interlock Switches
Operation
Optional Key Release
A key release unit is eas-
ily attached to the TL4024 to
provide emergency override of
the switch locking mechanism
by a qualified, responsible
person.
Flat Actuator
Flexible rubber mounting bush-
ings allow for some actuator
flexibility.
The head may be rotated in 90
degree increments to give 8
possible entry points.
90-Degree Actuator
Flexible rubber mounting bush-
ings allow for some actuator
flexibility.
Optional Slide Bolt
Allows easy installation of
switch on machine guards
Actuator included (order
switch separately)
Integral handle included
Robust for use with heavy
doors
Slotted hole in bolt permits
attaching multiple padlocks
Yellow color for easy
recognition
Flexible 1 Actuator
15 degree flexibility may be
adjusted with the set screw.
Flexible 2 Actuator
15 degree flexibility may be
adjusted with the set screw.
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TL4024 Safety Interlock Switches
Contact Arrangements
33
21
13
34
22
41 42
14
33
21
13
34
22
41 42
14
33
21
13
34
22
41 42
14
33
21
13
34
22
41 42
14
1URB 1 N/C as door unlock request contact + 2 N/O + 1 positively driven N/C contact
Request
Actuator Inserted Actuator
Inserted
Unocked
Inserted
Locked
Removed
Opened
1URB
With Unlock Request Contact PLUS
Back Load Unlocking
2WDB
3WDB
2 positively driven N/C contact + 1 N/O + 1/NC as door contact
2 positively driven N/C contact + 1 N/O + 1/NO as door contact
Locked Unlocked
Actuator Inserted Actuator
Removed
33
21
11
34
22
41 42
12
33
21
11
34
22
41 42
12
33
21
11
34
22
41 42
12
33
21
13
34
22
41 42
14
33
21
13
34
22
41 42
14
33
21
13
34
22
41 42
14
2WDB
3WDB
With Door Contact PLUS
With & Without Back Load Unlocking
Operation (continued) Applications
Typical applications are on
sliding guard doors and swing-
ing guard doors that must
remain locked until a signal is
applied to the internal solenoid
that unlocks the guard door.
Application Monitoring Units
SR125SMS45
Stop Motion
Sensing Unit
Used with the TL4019 for
machines with inconstant or
variable overrun. Senses back
EMF of AC or DC motors.
Failsafe and adjustable to a
range of 0.01 V to 0.10 V.
SR223SMT
Timer Unit
Used with the TL4019 for
machines with constant over-
run. Gives a timed delay to the
lock/release signal. Failsafe
and adjustable to a range of
times from 1.0 seconds up to
31 seconds.
Safety Monitoring
Relay Units
Safety monitoring relays ensure a
maximum level of safety by monitoring
all wiring in the safety circuit, including
switches and contactors. Any fault and
the power to the machine is switched off.
A variety of safety monitoring relay units
are available.
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TL4024 Safety Interlock Switches
33
1.3
40
1.57
24
0.94
48
1.89
15
0.59
A
A
30
1.18
14
0.55
21
0.83
3
0.12
8
0.31
Dimensions (mm/in.)
Flat Actuator 90-degree Actuator
TL4024
Travel
Travel
S
S
GN RD
Mechanical Unlocking
Mechanism
Mechanical Unlocking
Screw
1/2" NPT
1/2" NPT
134
5.28
For M5 >
ISO 1207 (DIN 84)
ISO 4762 (DIN 912)
240
9.45
25.5
1.004
59
2.32
39
1.53
18.8
0.74 21.5
0.85
30
1.18
45
1.77
58.5
2.303 46
1.81
4.5
0.18
42
1.65
8.5
0.335
4.5
0.18
33
1.3
40
1.57
24
0.94
54
2.13
15
0.59
A
A30
1.18
3
0.12
4.4
0.173
8
0.31
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TL4024 Safety Interlock Switches
Optional Metal Slide Bolt for TL4024
Door hung on right
40
1.57
40
1.57
X
Guard frame
M5 (4x)
For Screw M6
For Screw
M6
For Screw
M6
For
Screw
M6
30
1.18
Safety Screws
15
0.59 110
4.33
40
1.57 20
0.79
20
0.79
42
1.65
60
2.36
62
2.44
135
5.31
58
2.28
73.5
2.894
58
2.28
41.5
1.634
21.5
0.85
8
0.31
9.5
0.374
340
13.39
318
12.52
134
5.28
46
1.81
85
3.35
18
0.71
30
1.18
10
0.39
Dimensions (continued (mm/in.)
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TL4024 Safety Interlock Switches
Ordering
Model Solenoid Contacts Wiring Entry Part No.
Power to Unlock (with door contact)
TL4024-10242TM (flat actuator) 24 VAC/DC 2 N/C + 1 N/O + 1 N/C 3 x 0.5 in. NPT conduit 44535-0010
TL4024-10242SM (90-degree actuator) 24 VAC/DC 2 N/C + 1 N/O + 1 N/C 3 x 0.5 in. NPT conduit 44535-0110
TL4024-11102TM (flat actuator) 110 VAC 2 N/C + 1 N/O + 1 N/C 3 x 0.5 in. NPT conduit 44535-0020
TL4024-11102SM (90-degree actuator) 110 VAC 2 N/C + 1 N/O + 1 N/C 3 x 0.5 in. NPT conduit 44535-0120
TL4024-10243TM (flat actuator) 24 VAC/DC 2 N/C + 1 N/O + 1 N/O 3 x 0.5 in. NPT conduit 44535-0030
TL4024-10243SM (90-degree actuator) 24 VAC/DC 2 N/C + 1 N/O + 1 N/O 3 x 0.5 in. NPT conduit 44535-0130
TL4024-11103TM (flat actuator) 110 VAC 2 N/C + 1 N/O + 1 N/O 3 x 0.5 in. NPT conduit 44535-0040
TL4024-11103SM (90-degree actuator) 110 VAC 2 N/C + 1 N/O + 1 N/O 3 x 0.5 in. NPT conduit 44535-0140
TL4024-10242SKM w/key (90-degree actuator) 24 VAC/DC 2 N/C + 1 N/O + 1 N/C 3 x 0.5 in. NPT conduit 44535-1110
TL4024-11102SKM w/key (90-degree actuator) 110 VAC 2 N/C + 1 N/O + 1 N/C 3 x 0.5 in. NPT conduit 44535-1120
TL4024-10243SKM w/key (90-degree actuator) 24 VAC/DC 2 N/C + 1 N/O + 1 N/O 3 x 0.5 in. NPT conduit 44535-1130
TL4024-11103SKM w/key (90-degree actuator) 110 VAC 2 N/C + 1 N/O + 1 N/O 3 x 0.5 in. NPT conduit 44535-1140
Power to Unlock (with door contact) (with back load unlocking)
TL4024-30242TM (flat actuator) 24 VAC/DC 2 N/C + 1 N/O + 1 N/C 3 x 0.5 in. NPT conduit 44535-0410
TL4024-30242SM (90-degree actuator) 24 VAC/DC 2 N/C + 1 N/O + 1 N/C 3 x 0.5 in. NPT conduit 44535-0510
TL4024-31102TM (flat actuator) 110 VAC 2 N/C + 1 N/O + 1 N/C 3 x 0.5 in. NPT conduit 44535-0420
TL4024-31102SM (90-degree actuator) 110 VAC 2 N/C + 1 N/O + 1 N/C 3 x 0.5 in. NPT conduit 44535-0520
TL4024-30243TM (flat actuator) 24 VAC/DC 2 N/C + 1 N/O + 1 N/O 3 x 0.5 in. NPT conduit 44535-0430
TL4024-30243SM (90-degree actuator) 24 VAC/DC 2 N/C + 1 N/O + 1 N/O 3 x 0.5 in. NPT conduit 44535-0530
TL4024-31103TM (flat actuator) 110 VAC 2 N/C + 1 N/O + 1 N/O 3 x 0.5 in. NPT conduit 44535-0440
TL4024-31103SM (90-degree actuator) 110 VAC 2 N/C + 1 N/O + 1 N/O 3 x 0.5 in. NPT conduit 44535-0540
TL4024-30242SKM w/key (90-degree actuator) 24 VAC/DC 2 N/C + 1 N/O + 1 N/C 3 x 0.5 in. NPT conduit 44535-1180
TL4024-31102SKM w/key (90-degree actuator) 110 VAC 2 N/C + 1 N/O + 1 N/C 3 x 0.5 in. NPT conduit 44535-1190
TL4024-30243SKM w/key (90-degree actuator) 24 VAC/DC 2 N/C + 1 N/O + 1 N/O 3 x 0.5 in. NPT conduit 44535-1510
TL4024-31103SKM w/key (90-degree actuator) 110 VAC 2 N/C + 1 N/O + 1 N/O 3 x 0.5 in. NPT conduit 44535-1520
Power to Lock (with door contact)
TL4024-20242TM (flat actuator) 24 VAC/DC 2 N/C + 1 N/O + 1 N/C 3 x 0.5 in. NPT conduit 44535-0050
TL4024-20242SM (90-degree actuator) 24 VAC/DC 2 N/C + 1 N/O + 1 N/C 3 x 0.5 in. NPT conduit 44535-0150
TL4024-21102TM (flat actuator) 110 VAC 2 N/C + 1 N/O + 1 N/C 3 x 0.5 in. NPT conduit 44535-0060
TL4024-21102SM (90-degree actuator) 110 VAC 2 N/C + 1 N/O + 1 N/C 3 x 0.5 in. NPT conduit 44535-0160
TL4024-20243TM (flat actuator) 24 VAC/DC 2 N/C + 1 N/O + 1 N/O 3 x 0.5 in. NPT conduit 44535-0070
TL4024-20243SM (90-degree actuator) 24 VAC/DC 2 N/C + 1 N/O + 1 N/O 3 x 0.5 in. NPT conduit 44535-0170
TL4024-21103TM (flat actuator) 110 VAC 2 N/C + 1 N/O + 1 N/O 3 x 0.5 in. NPT conduit 44535-0080
TL4024-21103SM (90-degree actuator) 110 VAC 2 N/C + 1 N/O + 1 N/O 3 x 0.5 in. NPT conduit 44535-0180
Switch Only Models (no actuator and no adapter included)
Power to Unlock (with door contact)
TL4024-10242 24 VAC/DC 2 N/C + 1 N/O + 1 N/C 3 x 0.5 in. NPT conduit 44535-2010
TL4024-11102 110 VAC 2 N/C + 1 N/O + 1 N/C 3 x 0.5 in. NPT conduit 44535-2020
TL4024-10243 24 VAC/DC 2 N/C + 1 N/O + 1 N/O 3 x 0.5 in. NPT conduit 44535-2030
TL4024-11103 110 VAC 2 N/C + 1 N/O + 1 N/O 3 x 0.5 in. NPT conduit 44535-2040
Power to Unlock (with door contact) (with back load unlocking)
TL4024-30242 24 VAC/DC 2 N/C + 1 N/O + 1 N/C 3 x 0.5 in. NPT conduit 44535-2410
TL4024-31102 110 VAC 2 N/C + 1 N/O + 1 N/C 3 x 0.5 in. NPT conduit 44535-2420
TL4024-30243 24 VAC/DC 2 N/C + 1 N/O + 1 N/O 3 x 0.5 in. NPT conduit 44535-2430
TL4024-31103 110 VAC 2 N/C + 1 N/O + 1 N/O 3 x 0.5 in. NPT conduit 44535-2440
Power to Lock (with door contact)
TL4024-20242 24 VAC/DC 2 N/C + 1 N/O + 1 N/C 3 x 0.5 in. NPT conduit 44535-2050
TL4024-21102 110 VAC 2 N/C + 1 N/O + 1 N/C 3 x 0.5 in. NPT conduit 44535-2060
TL4024-20243 24 VAC/DC 2 N/C + 1 N/O + 1 N/O 3 x 0.5 in. NPT conduit 44535-2070
TL4024-21103 110 VAC 2 N/C + 1 N/O + 1 N/O 3 x 0.5 in. NPT conduit 44535-2080
Accessories Model No.
Standard Actuators with Rubber Bushing
Replacement flat actuator RB for TL4024 44535-0700
Replacement 90-degree actuator RB for TL4024 44535-0710
Overtravel Actuators with Rubber Bushing
Replacement flat actuator OTRB for TL4024 44535-0720
Replacement 90-degree actuator OTRB for TL4024 44535-0730
Accessories Model No.
Flexible Actuators
Replacement flex 1 actuator for TL4024 44535-0750
Replacement flex 2 actuator for TL4024 44535-0760
Slide Bolts
Bracket with handle for right-hung door for TL4024 (yellow) 44535-8000
Bracket with handle for left-hung door for TL4024 (yellow) 44535-8010
Miscellaneous
Key lock release for TL4024 (2 keys included) 44535-0802
Spare keys for key lock above (44535-0802) for TL4024 44535-0812
Spare keys for key lock (44535-0800, no longer available) 44535-0810
Unique key lock release for TL4024 (2 unique keys included)
44535-0820
Replacement head for TL4024 (Not available for 44535-
0470, 0570, 1570)
44535-0740
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Authorized Distributor:
C37I-E-02 02/17 Note: Specifications are subject to change. © 2017 Omron. All Rights Reserved. Printed in U.S.A.
Printed on recycled paper.
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