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  • New item   Signal tower (stack light) with audible signal | LED | red + yellow + green | 4 W | Ø50 mm | 24 V DC | 360° visibility | IP53 | foldable | black | ES-M4-50SB
    New item   Signal tower (stack light) with audible signal | LED | red + yellow + green | 4 W | Ø50 mm | 24 V DC | 360° visibility | IP53 | foldable | black | ES-M4-50SB 1
    New item   Signal tower (stack light) with audible signal | LED | red + yellow + green | 4 W | Ø50 mm | 24 V DC | 360° visibility | IP53 | foldable | black | ES-M4-50SB 2
    New item   Signal tower (stack light) with audible signal | LED | red + yellow + green | 4 W | Ø50 mm | 24 V DC | 360° visibility | IP53 | foldable | black | ES-M4-50SB 3

    Signal tower (stack light) with audible signal | LED | red + yellow + green | 4 W | Ø50 mm | 24 V DC | 360° visibility | IP53 | foldable | black | ES-M4-50SB

    Code: ES-M4-50SB
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    Price 42.30 € VAT incl.
    ( 34.96 € VAT excl. )
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    ES-M4-50SB is a three-segment LED signal tower (stack light) with an integrated buzzer, designed to indicate equipment and process status on production lines, machine tools, automation panels and workshops. The red, yellow and green segments are visible through a 360° angle, the audible signal backs up critical alerts in noisy environments, and the foldable design protects the tower during transport and when the equipment is not in use. Powered by 24 V DC, with a Ø50 mm housing and IP53 protection rating.

  • Product description

    Signal tower (stack light) with audible signal | LED | red + yellow + green | 4 W | Ø50 mm | 24 V DC | 360° visibility | IP53 | foldable | black | ES-M4-50SB

    ES-M4-50SB is a three-segment LED signal tower (stack light) with an integrated buzzer, designed to indicate equipment and process status on production lines, machine tools, automation panels and workshops. The red, yellow and green segments are visible through a 360° angle, the audible signal backs up critical alerts in noisy environments, and the foldable design protects the tower during transport and when the equipment is not in use. Powered by 24 V DC, with a Ø50 mm housing and IP53 protection rating.

    Key idea:
    An operator cannot watch a screen at all times, and on the shop floor a siren without colour tells you nothing. A three-colour tower shows status from anywhere on the shop floor, and the buzzer "calls out" when a fault occurs. It is the cheapest way to reduce downtime – a fault is noticed within seconds, not minutes.
    Colours
    red / yellow / green (RYG)
    Power supply
    24 V DC, 4 W
    Diameter
    Ø50 mm
    Protection
    IP53

    How it works

    Each segment of the tower has its own LED module and its own control conductor. The controller (PLC, relay or machine control unit) applies 24 V DC to the required segment – green for "running", yellow for "attention", red for "fault / stop". The buzzer has its own conductor, so the sound can be activated only for critical events or together with the red segment.

    Specially designed lenses diffuse the light through a 360° angle – the signal is equally visible from all sides, not just from the front. The LED source lasts up to 50,000 hours, so the tower needs no servicing and no bulb replacement. The base is round, the housing is made of ABS and aluminium; a foldable hinge allows the tower to be lowered flat when transporting machine tools or during storage.

    What makes the ES-M4-50SB useful?
    It is a complete signalling set in a single product: three colours, sound and mounting – no need to combine separate modules. The compact Ø50 mm housing suits small machine tools, laboratory equipment and automation cabinets, where a larger Ø70 tower would be too bulky. The 24 V DC supply matches the standard PLC and automation voltage.

    Technical specifications

    Model ES-M4-50SB
    Product type Signal tower (stack light) with buzzer
    Supply voltage 24 V DC
    Power 4 W
    Light source LED
    Service life up to 50,000 h
    Number of segments / colours 3 – red, yellow, green (RYG)
    Visibility angle 360°
    Audible signal Integrated buzzer, separately controlled
    Diameter Ø50 mm
    Housing material ABS + aluminium
    Mounting Round base, foldable hinge
    Protection rating IP53
    Bracket colour Black
    Current consumption ≤ 0.17 A (4 W / 24 V, all segments + buzzer)
    Connection Common power conductor + separate control conductors for each segment and the buzzer
    Recommended control output PLC / relay 24 V DC, ≥ 0.2 A per channel
    Dimensions, cable length, sound level dB As per the manufacturer's datasheet – provided on request
    Application Machine tools, production lines, automation panels, conveyors

    Key features

    • Three-colour signalling – standard RYG logic: fault / warning / running.
    • 360° visibility – the lens design diffuses light in all directions.
    • Integrated buzzer – sound backs up critical signals in noisy environments.
    • Foldable design – protection against mechanical damage during transport.
    • LED, 50,000 h – maintenance-free throughout the equipment's service life.
    • 24 V DC – direct connection to PLC outputs or relays without extra power supply.

    Where is it used?

    • CNC machine tools and machining centres – cycle-end and fault indication
    • Production and packaging lines – line status for operators and supervisors
    • Conveyors and logistics systems – stoppage signalling
    • Automation and control panels – PLC status display
    • Test benches and laboratory equipment
    • Robotic workstations – safety zone status
    • Workshops and garages – process indication (e.g. compressor, presses)
    • Server rooms and technical premises – emergency status signal

    Use by need

    For home use.
    In a workshop or garage the tower shows when the equipment is running, when a cycle has finished and when a fault has occurred – no need to stand next to it. All that is needed is a 24 V DC power supply and simple switches or relays.
    For companies and production.
    Identical towers on every machine tool let the supervisor immediately see which line is stopped. The buzzer reduces reaction time to faults, and the foldable design protects the tower when moving equipment.
    For automation engineers.
    Connects directly to PLC transistor or relay outputs (24 V DC, total load 4 W). Each segment and the buzzer are controlled separately, so the PLC program can implement flashing or sound for specific faults only. Total current ≤0.17 A – suitable for standard 0.5 A transistor outputs. Before connecting, check the polarity of the common conductor (PNP/NPN compatibility). The Ø50 mm size fits where a Ø70 tower would not.

    Practical example

    An ES-M4-50SB is installed on a packaging line, controlled by a PLC. Green stays on while the line is running; when the film runs out, the PLC switches on yellow and the operator prepares to change it; if a product jams – red and the buzzer activate, and the line stops. A supervisor at the other end of the shop floor sees which line has stopped and why, and downtime is cut from several minutes to seconds.

    Pros

    • All-in-one – three colours, buzzer and mounting.
    • 360° visibility – no need to turn the tower towards the operator.
    • Compact Ø50 mm – fits small machine tools and panels.
    • Foldable – fewer breakages during transport.
    • Economical – 4 W, maintenance-free LED.
    • Standard voltage – 24 V DC, same as PLCs and sensors.

    Cons / limitations

    • 24 V DC only – 230 V AC systems need a power supply unit or a different model.
    • IP53 – resistant to dust and splashes, but not suitable for outdoor conditions without a canopy or for wash-down areas.
    • Cable length and core marking – check before designing the route; longer distances will require a junction box.
    • 3 segments – a fourth colour (blue) requires a different model.
    • Ø50 mm gives a smaller light area than Ø70 – large shop floors may need a bigger tower.

    Safety and installation notes

    • Connect only to 24 V DC – a higher voltage will damage the LED modules.
    • Observe polarity according to the cable marking; connect the control conductors via PLC outputs or relays (≥0.2 A per channel).
    • Mount on a flat surface via the round base; lock the hinge in the working position.
    • Do not mount in locations where the tower could be struck by moving parts or cranes – or use the folding function.
    • Use outdoors only under a canopy – IP53 does not protect against a direct jet of rain.
    • Route cables through the cable entry in the base and protect them from mechanical damage.

    Quick selection guide

    Colours
    red / yellow / green (RYG)
    Power supply
    24 V DC, 4 W
    Diameter
    Ø50 mm
    Protection
    IP53
    Suitable when you need:
    • to show machine tool or line status in three colours;
    • an audible signal for faults in a noisy environment;
    • a compact Ø50 mm tower for 24 V DC control.
    Check before use:
    • whether you have a 24 V DC supply and control outputs;
    • whether 3 colours are enough (or whether blue / white is needed);
    • whether the environment meets IP53 (indoors, no direct water);
    • whether the mounting location allows 360° visibility.
    Important reminder:
    A signal tower only indicates status – it does not stop the equipment and does not replace an emergency stop (E-STOP) circuit. Safety functions must be implemented separately in accordance with machinery safety requirements.

    FAQ

    Can it be connected to 230 V?
    No, 24 V DC only. For 230 V use a 230/24 V DC power supply unit.
    Can the buzzer be switched off?
    Yes – the buzzer is controlled by a separate conductor; it can be left unconnected or activated only together with the red segment.
    Can the segments flash?
    The standard mode is a steady light; flashing is most conveniently implemented in the PLC program by controlling the segment output.
    Is it suitable for outdoor use?
    IP53 – only under a canopy, with no direct rain and no wash-down.
    What is the hinge for?
    To fold the tower down when transporting machine tools or when it is not in use, so it does not get broken off.
    How much current does the tower draw?
    No more than 0.17 A at 24 V (4 W) – considerably less per PLC output, so no additional relays are needed.

    Signal tower (stack light) with audible signal | LED

    ES-M4-50SB is a three-segment LED signal tower (stack light) with a buzzer: red, yellow and green, 360° visibility, 24 V DC, 4 W, Ø50 mm, IP53, foldable design, black bracket. Designed to indicate the status of machine tools, production lines, conveyors and automation panels, with an audible signal for critical events.

    Illustrative image may have been created using AI. The appearance of the product may differ slightly from the image shown. Please refer to the technical specification.

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