The secret behind the SEC series is an EC (electronically commutated) fan. Globally, STULZ was the first manufacturer to develop a complete series of precision air conditioning units based on EC technology. Now, we’re the first manufacturer bringing EC technology to India. What is an EC motor? An EC motor is a DC motor with a shunt characteristic. The rotary motion is achieved by supplying the power via a switching device – the commutator. Previously, the commutator was realised using mechanical carbon brushes, and hence, had a limited service life of only a few thousand hours. On EC motors, this commutation is performed electronically, and therefore, wear free offering a service life of 80,000 hours. Powerful Innovation. with energy saving No down time 80,000 hours of assured reliability Maintenance-free operating life via direct drive fan technology Most reliable for precision air conditioning applications.