General
Storage temperature	-40 °C
Operation temperature	-25 °C
Relative humidity	max 95 %
Housing degree of protection	IP 66
Selection method	MFV
CE conformity	EN 50081, EN 50082, EN 60950, network access according to CTR21
Tone call volume	60 dB(A)
Terminal clamps	0,08 – 2,5 mm²
Cable gland	M16
Blind plugs	1 x M16
Handset	M12Flex
Housing material	Polyamide
Fastener screw material	V4A (1.4571)
Mounting hole pitch	128-134 mm
Functions	Redial, Mute, Hearing amplifier 4x + 3dB, Flash, 4 direct dial numbers, Loudspeaker, Speed dial

The Vershoven industrial telephone model A24, manufacturer's number 01.41000, is a weatherproof device designed for use in dusty and humid environments. It is designed for multi-frequency and pulse dialing and can be used as a station or endpoint in analog telephone systems. The telephone features a robust control panel with 16 keys, which are optionally available with backlighting. An infinitely adjustable holder ensures that the handset remains securely positioned even under vibrations. An integrated hearing amplifier can be activated to improve audibility under poor acoustic conditions. Optionally, up to two special keys can be added, which can be assigned additional functions according to requirements.

Applications
The A24 is designed for industrial and outdoor applications where high mechanical stress, humidity, or dust is present. It is suitable for use in production halls, warehouses, tunnels, or other environments where a conventional telephone would not be adequately protected. The IP66 protection rating ensures dust-tight and water-tight sealing, enabling outdoor use. The operating temperature range of -25 °C to +55 °C and storage temperature range of -40 °C to +70 °C make the device suitable for a wide range of climatic conditions.

Functions and Equipment in Detail
The telephone offers a variety of functions, available depending on the key configuration. These include redial, mute function, flash, loudspeaker, speed dialing, and the ability to store up to four destination numbers. The ring tone volume ranges from 60 dB(A) to 90 dB(A) at a distance of one meter, ensuring good audibility even in noisy environments. The terminal blocks are designed for cable cross-sections from 0.08 to 2.5 mm² and support single, multi, and fine-stranded cables. The M16 cable gland allows connection of cables with a diameter of 5 to 10 mm. A blind plug in M16 size is also included.

Technology Explained Simply
The enclosure is made of polyamide, a robust plastic that withstands mechanical stress and chemical influences. The fastening screws are made of V4A steel (material 1.4571), ensuring high corrosion resistance. The handset connection is made via an M12Flex connector, supporting cables with a diameter of 3 to 6.5 mm. The IP66 protection rating means the device is dust-tight and protected against water jets from any angle, making it suitable for outdoor use or in humid indoor environments. CE conformity according to EN 50081, EN 50082, and EN 60950, as well as network access in accordance with CTR21, ensures compliance with European safety and EMC directives.

Compatibility and Accessories
The A24 is designed for connection to standard telephone systems and supports the MFV (multi-frequency dialing) method. It can be used as an endpoint or station in analog telephone networks. The version with a coiled handset cord is standard. Additional variants such as A24ZB/AL-Basic or A24OB are also available, with the latter configurable for standalone telephone lines. The mentioned models differ in features such as an integrated power-saving mode or the ability to connect up to ten different telephone lines.

Mounting and Installation
Mounting is done via mounting holes with a spacing of 128 to 134 mm. The device measures 105 mm (depth) × 154 mm (width) × 221 mm (height) and weighs approximately 1.25 kg. Installation requires no special tools, as connections are made via terminals and cable glands. The M16 cable gland enables a secure and waterproof connection. The terminal blocks are compatible with a wide range of cable types, increasing installation flexibility.

Operational Advantages
The A24 offers high reliability in demanding environments. The robust construction from polyamide and V4A steel ensures a long service life. The infinitely adjustable handset holder prevents the handset from falling during vibrations. The integrated volume control and hearing amplifier enable clear communication even in noisy environments. Functions such as redial, mute, and flash simplify daily operation. The IP66 protection rating and high temperature resistance make the device a reliable solution for industrial and outdoor applications.