Chromalox replacement temperature controller is pcn 314510 4040-rrr000, 1/4 din, soft start,universal input, output 1 relay (2amp resistive at 240VAC), output 2 relay (2amp resistive at 240VAC), output 3 relay (2amp resistive at 240VAC),100-240 VAC Power Supply.

Chromalox 4040 Controller Operating Manual

Chromalox 4040 Catalog Page