EUCHNER CTM-LBI-BP-U-AZ-SA Guard Lock

Name: EUCHNER CTM-LBI-BP-U-AZ-SA Guard Lock | Seven Star LLC
Brand: EUCHNER
SKU: CTM-LBI-BP-U-AZ-SA

Compact bistable guard locking for small doors and flaps

The EUCHNER CTM-LBI-BP-U-AZ-SA (order no. 166089) is a compact transponder-coded safety switch with guard locking. Its slim housing suits small guards, service flaps and doors where there is little space for a larger locking device. It works with a ball-type actuator, and EUCHNER lists actuators for hinged doors with radii from 150 mm.

The key feature of this version is BiState, or bistable, guard locking. The locking state is kept when the power fails: an open door cannot lock itself, so a person cannot be locked in by accident, and an active lock is not released by a power failure. This sets the CTM apart from classic power-to-lock or power-to-unlock devices, where the behaviour on power loss is fixed by the operating principle.

Technical specifications

Parameter	Specification
Order number	166089
Guard locking principle	BiState (bistable)
Locking force	Fmax 1300 N; FZh 1000 N
Coding	Unicode (RFID transponder)
Operating voltage	24 V DC, -15% to +15%, regulated; max. 500 mA
Solenoid control input IMP	20.4 to 26.4 V DC = unlock; 0 to 5 V DC = lock
Safety outputs	FO1A/FO1B, 2 p-switching semiconductor outputs, 1 to 150 mA; DC-13 24 V 150 mA
Monitoring outputs	OI (diagnosis), OD/C (door position/communication), OL (guard lock), 1 to 50 mA
Turn-on time / risk time	max. 400 ms / max. 200 ms (+10 ms per additional device)
Switching frequency	max. 0.25 Hz
Connection	M12 plug connector, 8-pin
Actuating / extraction / retention force	20 N / 18 N / 5 N
Overtravel	2 mm
Mechanical life	1 x 10⁶ operations
Degree of protection	IP65 / IP67 (connector screwed tight)
Ambient temperature	-20 to +60 °C
Material	Reinforced thermoplastic housing; FKM seals
Guard lock monitoring	PL e, category 4, PFHD 4.11 x 10⁻⁹
Control of guard locking	PL d, category 3, PFHD 1.03 x 10⁻⁷

Signals and control of the lock

Unlike solenoid-type devices, the CTM is supplied with one 24 V DC voltage for both the electronics and the locking mechanism. The lock is switched by the IMP control input: a high level opens the guard locking, a low level closes it. Besides the two safety outputs, the switch provides three monitoring outputs, so the PLC can distinguish between door closed, guard locked and a diagnostic fault. Via OD/C, the switch can also communicate with an EUCHNER IO-Link gateway. An auxiliary release on the front allows the door to be opened during a malfunction.

Selection and mounting notes

The actuator is not included. EUCHNER lists the rigid ball actuator A-B-A1-A1-161642 and the floating-bearing version A-B-A5-A1-168489 for door radii from 150 mm; both come with two M4x14 safety screws. For cables, pre-assembled M12 8-pin leads are offered with sockets at one or both ends. The locking force of 1000 N (FZh) suits light guards; for heavy doors that may be pulled or kicked, the CTP or a multifunctional system such as the MGB2 offers higher forces. The outputs need a free-wheeling diode when switching inductive loads.

Documents and quotation

The attached EUCHNER operating instructions cover the CTM-LBI-BP/BR devices with IMP control input. For a quotation, give the order number 166089, the actuator, the cable type and length, and the quantity. Related devices are listed under Safety Switches & Guard Locking.

EUCHNER manufactures industrial safety components and systems for machine access and guard monitoring. Its product range includes electromechanical safety switches, transponder-coded devices, guard-locking systems and electronic key systems. These components support applications in automated manufacturing, assembly, material handling and other machine environments. EUCHNER selections depend on the actuator, locking principle, contact arrangement, interface and installation requirements. A switch or actuator is one part of a safety function; the complete system must be designed and validated for its intended application. For enquiries through Seven Star LLC in Oman and the GCC, provide the full order number, installed device details and required mating components.

Frequently Asked Questions