Release Switch and IRPB in New Design

The ERRS Control Unit; Release Switch and Input Sensor; IRPB (Intelligent Remote Push Button) are redesigned.
The main benefits are:
Smaller footprint, easier installation, improved quality, IP66 (for installation on deck, installing into a cabinet is still recommended)

HM-0450 will be replaced by HM-0550
HM-0451 by HM-0551
HM-0452 by HM-0552