TK versions are for use with fans fitted with thermal cut-out protection. In the event of the thermal cut-out, opening the controller will switch off and the trip indicator will be illuminated. Units are complete with illuminated on/off and start button. The start button must be pressed to start the controller once on/off switch is in the on position.

• 149-EL21 suitable for a maximum full load of 1.5 amps
• 149-EL31 suitable for a maximum full load of 3 amps
• 149-EL31TK suitable for a maximum full load of 3 amps *
• 149-EL41 suitable for a maximum full load of 4 amps
• 149-EL61 suitable for a maximum full load of 6 amps 
• 149-EL61TK suitable for a maximum full load of 6 amps * 
• 149-EL101 suitable for a maximum full load of 10 amps

* TK Versions offer means of motor protection via motor thermal Contact.

The EL range of fan speed controllers can be used with any manufacturers fans / motors which are single phase and suitable for speed control via 2 or 3 wires (+earth) including

• Flakt Woods
• Ziehl Abegg
• Elta
• Helios
• Solar and Palau
• Nuaire
• Systemair
• Vent-Axia
• Roof Units