The Siemens SENTRON 4AC3716-0 is a 16 VA safety transformer designed for continuous-duty SELV circuits — differentiating it from the bell transformer series which are rated for intermittent use only. It delivers a stable 8 V AC output at up to 2 A continuous for switching relays, Insta contactors, and low-voltage control circuits in building automation. A built-in PTC thermistor provides automatic short-circuit and overload protection with self-resetting behavior. The 2-module (36 mm) DIN rail format installs in standard distribution boards, and safety class II construction eliminates the need for a protective earth connection.

Key Features

• Continuous-duty rating — 16 VA for permanent-load control circuits
• 8 V AC SELV output — safe voltage for touch-accessible installations
• Built-in PTC protection — auto-reset short-circuit and overload proof
• Safety class II — no earth connection required, 4 kV isolation
• Compact 2-module (36 mm) DIN rail housing
• EN 61558-2-6 certified for safety isolating transformer applications

Technical Data

Applications

Continuous low-voltage control in building automation: switching relays, Insta contactors, stairwell lighting timers, and HVAC actuator control circuits. The 8 V SELV output is suitable for permanently energized circuits in accessible locations per building wiring regulations.