EATON TR-G3/18 Control Transformer 230V to 4/8/12V AC, 18VA, Screw Terminals

The EATON TR-G3/18 stands apart from typical doorbell transformers by offering three selectable secondary voltages in a single compact unit. Instead of being locked into one output, installers can choose 4 V, 8 V, or 12 V AC on-site, making this transformer a flexible solution for a wide range of low-voltage control circuits, signaling systems, and doorbell installations. Its 18 VA rated power ensures reliable operation even when multiple chimes or actuators are connected.

Highlights

• Multi-voltage secondary: 4 V / 8 V / 12 V AC, selectable via screw terminals
• Rated power: 18 VA, sufficient for most doorbell and control applications
• Primary voltage: 230 V AC, 50/60 Hz, suitable for European mains
• Robust control transformer design with screw terminals for secure wiring
• Compact and durable construction, ideal for installation in distribution boards or enclosures

In daily use

Installation is straightforward: connect the 230 V mains to the primary screw terminals, then select the required secondary voltage by wiring to the corresponding terminals. The transformer operates silently and efficiently, with minimal heat generation under rated load. Its single-phase design and standard mounting dimensions make it easy to integrate into existing electrical panels or new projects. Whether powering a classic doorbell, a control relay, or a small signaling device, the TR-G3/18 delivers stable AC voltage without the need for separate power supplies.

Full specifications

• Input voltage: 230 V AC
• Output voltage 1: 4 V AC, output current: 2 A
• Output voltage 2: 8 V AC, output current: 2 A
• Output voltage 3: 12 V AC, output current: 1.5 A
• Rated power: 18 VA
• Frequency: 50/60 Hz
• Transformer type: Control transformer
• Number of phases: Single-phase
• Primary connection type: Screw terminals
• Secondary connection type: Screw terminals
• Product series: TR-G3
• Manufacturer: Eaton
• Model identifier: G3/18

Final note

With its selectable outputs and robust build, the TR-G3/18 is a versatile choice for any low-voltage control or signaling application.