The STW & STD series step transformers enable fan motor speed control in steps. The STW series are intended for single-phase applications and the STD series for three-phase applications. The STW & STD series both are available in 2 versions: manual and automatic control. For each version a range with various maximum output currents is available. • Robust, insensitive for short time power peaks and overloads • Applicable for both new and existing ventilation systems • STD & STW versions: Manual step speed control • STW-A & STD-A versions: Automatic step speed control to combine with Mf-Net thermostats Mf-Net thermostats STD & STW: Manual fan speed control STW-A & STD-A: Automatic fan speed control

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