ABB TM15/24 Doorbell Transformer 15VA 24VAC DIN Rail

The ABB TM15/24 stands apart from typical doorbell transformers by combining three selectable secondary voltages in one compact DIN-rail module, eliminating the need for separate units when installations call for 8 V, 12 V, or 24 V AC. Its 15 VA rated power and thermal protection make it a reliable backbone for residential and commercial bell systems, while the 2-module width keeps control cabinets tidy.

Highlights

• Selectable output: 8 V AC, 12 V AC, or 24 V AC via screw terminals
• 15 VA continuous power for doorbells, chimes, and signaling circuits
• Thermal short-circuit and overload protection for long service life
• DIN rail (REG) mounting with only 2 modules (36 mm) width
• Safety transformer according to EN 61558-2-8, insulation class E
• IP20 protection, suitable for distribution boards and dry indoor locations

In daily use

Installation is straightforward: snap the TM15/24 onto a standard 35 mm DIN rail, connect the 230 V AC primary, and choose the required secondary voltage by wiring to the appropriate output terminals. The screw terminals accept solid or stranded conductors up to 2.5 mm², and the clear labeling on the front face reduces wiring errors. Because the transformer is short-circuit proof by thermal design, momentary overloads from chime solenoids or long cable runs will not cause permanent damage. The operating temperature range of -20 °C to +40 °C allows use in unheated entrance areas or utility rooms, though condensation must be avoided.

Full specifications

• Brand: ABB
• Model: TM15/24
• MPN: 2CSM228745R0802
• EAN: 8012542287452
• Type: Doorbell transformer (safety transformer)
• Input voltage: 230 V AC, 50/60 Hz
• Output voltage: 8 V AC / 12 V AC / 24 V AC (selectable)
• Rated power: 15 VA
• Maximum secondary current: 1.875 A at 8 V
• Primary current: 0.065 A
• Mounting: DIN rail (REG)
• Module width: 2 modules (36 mm)
• Installation depth: 65 mm
• Protection class: IP20
• Insulation class: E
• Short-circuit protection: Thermal
• Overload protection: Thermal
• Connection type: Screw terminals
• Housing material: Thermoplastic
• Safety standard: EN 61558-2-8
• Degree of pollution: 2
• Operating temperature: -20 °C to +40 °C

Final note

With its triple-voltage output, thermal protection, and compact DIN-rail format, the ABB TM15/24 is a versatile and durable choice for any doorbell or signaling circuit that demands a safe, low-voltage supply from the mains.