The Siemens SENTRON 4AC3724-0 is a 24 VA continuous-duty safety transformer offering dual 8 V or 12 V SELV output — twice the power of the 4AC3716-0 with the added flexibility of a selectable secondary voltage. This makes it suitable for control circuits that may use either 8 V or 12 V devices, or where the load has grown beyond the 16 VA class. The 3-module (54 mm) DIN rail housing accommodates the larger core needed for 24 VA continuous output. PTC protection and safety class II construction ensure reliable, maintenance-free operation in building distribution panels.

Key Features

• 24 VA continuous-duty rating — powers larger control relay and contactor loads
• Selectable 8 V / 12 V secondary — flexibility for different control device voltages
• Built-in PTC protection with auto-reset — no fuse replacement needed
• Safety class II, 4 kV primary-to-secondary isolation
• EN 61558-2-6 certification for safety isolating transformer applications
• 3-module (54 mm) DIN rail format — compact for the power class

Technical Data

Applications

Building automation control circuits: multi-relay switching panels, Insta contactor groups, hotel room control systems, and commercial lighting contactors. The selectable 8 V/12 V output provides compatibility with both legacy 8 V relays and newer 12 V control devices from a single transformer.