Siemens Combustion RWF55.50A9 Controller 321894-708 While the 29 Series has

While the 29 Series has models for air (K suffix)

High Amperage Rating: Rated for 30A @ 120-250V AC and 22A @ 277V AC

Durable Sheath Material: Engineered to withstand high-velocity airflow and thermal expansion stress

Integrated Control: Combines manual gas shut-off and thermal regulation into one heavy-duty oven control

Siemens Combustion RWF55.50A9 Controller 321894-708 While the 29 Series hasThe Siemens Combustion RWF55. 50A9 Controller is a high performance, 3 position analog controller engineered for precise temperature and pressure regulation in multi stage or modulating burners. This compact universal controller features a built in RS 485 Modbus interface, allowing for seamless integration into complex combustion management systems or master lead lag panels. Designed with a 96x48mm standard DIN profile, it provides a dual 4 digit LCD