Littelfuse EL731-10-00 is a versatile relay with a frequency range of 0-6000Hz. It features standard conformal coating and 3 Form C relay contacts (N.O./N.C), offering fail-safe/non-fail-safe operation. It supports IEEE device numbers 38-49-50G-50N-51G-51N-79G and offers front-panel or remote N.O. contact reset options. With standard harmonic filtering and various system types supported, it provides reliable protection. The relay operates at both 24V AC and 48V DC supply voltages and offers latching trip or non-latching alarm options for auto-manual reset. Communication capabilities are not included, and it supports a GF trip level of 0.03-5.00A. The sensor configuration is a single PTC/RTD, and mounting options include DIN, panel, or optional surface mounting.