Wireless crane remote control | 4 buttons + STOP + key | 1 speed | 310–320 MHz | 220/110 V AC | IP65 | ES-21-4S

Wireless crane remote control ES-21-4S – 4 buttons, 1 speed, OFF/ON/START key

ES-21-4S is a radio remote for a simple crane, hoist or winch with two motions. The operator presses a button on the transmitter, the signal goes by radio to the receiver, and the receiver relays switch the coils of the corresponding contactors.

• 4 direction buttons – two motions, e.g. hoist up / down and trolley left / right
• OFF / ON / START key – with the key removed nobody can use the remote
• Mushroom STOP – latches when pressed, released only by a deliberate twist
• MAIN relay – drops the main contactor on STOP or loss of signal
• 10 A, 250 V AC relays – ample margin for contactor coils
• LED battery indicator – change batteries in time, not mid-lift

• ES-21-4D – Same housing and 4 buttons, but two-step – 2 speeds. Choose it if the hoist has a 2-speed motor or a frequency inverter.
• ES-21-2S – 2 buttons – one motion only (up / down). Enough for a simple lift or winch.
• ES-F21-4SE – Compact 4-button remote in the 868 MHz band – an EU SRD frequency when 310–320 MHz is not suitable.
• ES-F21-E1-TX – 6 buttons + START/STOP and a 24–440 V AC/DC receiver – when you need 3 motions.

• Electric hoists with hoisting and trolley travel
• Small single-girder overhead and gantry cranes in workshops
• Electric winches with two motions
• Lifting equipment in warehouses and repair shops
• Replacing a pendant when the cable gets in the way or keeps breaking

• Receiver relays switch contactor coils only, never the motor directly – 10 A is for the control circuit.
• The receiver supply voltage must match the control circuit (contactor coil) voltage.
• Wire the MAIN relay into the main contactor KM0 circuit – STOP and loss of signal must stop the crane (EN 60204-32).
• Limit switches (SQ) and NC interlocking of opposite directions stay in the circuit – the remote does not replace them.
• Before installation or repair, switch off the main isolator and lock it out (LOTO).
• After installation, test every direction and STOP without a load.

Quick selection guide

Check before ordering:

• Contactor coil voltage = receiver supply (220 V AC or 110 V AC version).
• 310–320 MHz – check whether the frequency is permitted in your country.
• How many motions and speeds you need: 2 motions, 1 speed – this model; 2 speeds – ES-21-4D.

ES-21-4S – 4 buttons, 1 speed, key

Compact wireless remote for two crane motions at one speed, with mushroom STOP and removable key. Before ordering, confirm the receiver supply and that the radio frequency is permitted.