United Electric Controls Temperature Switch . The 100 series is simple to install and operate for alarm, safety and emergency shutdown applications where preserving process uptime, and protecting. Versatile, nema 4x, spdt/dpdt switch. B100 120 Temperature Switch 0 225F Local Mount NEMA 4X from Davis from www.davis.com The 100 series is simple to install and operate for alarm, safety and emergency shutdown applications where preserving process uptime, and protecting. Versatile, nema 4x, spdt/dpdt switch. Rugged temperature switch with external dial and remote bulb and capillary.