Pro Series Bell Transformers.

Features:
Constructed from fire and heat resistant self extinguishing plastic.
Safe electrical separation between primary and secondary circuits.
Provides highly accurate extra low voltage up to 24V AC
Low operating temperature.
Fits all standard consumer units
Standard 35mm DIN rail mount

Technical Data:
Rated input voltage: 230V 50/60Hz
Rated output voltage: 4, 6, 8, 12, 16, 24V
Rated power output: 8 VA
Power consumption: 1.15w
Service: continuous operation
Connection: Pillar terminal with clamp. 10mm
Module width: 36mm