SZ-HB is an auxiliary contact block designed for use with Fuji Electric SH-4 and SH-5 series industrial relays. This component enables field modification and expansion of relay contact configurations, allowing users to customize the number and arrangement of normally open (NO) and normally closed (NC) contacts according to application requirements. The block features bifurcated contacts with excellent electrical conductivity and can be mounted either at the front or side of the relay base. SZ-HB is compatible with standard SH-4 and SH-5 relays rated at 10A thermal current, supporting various contact arrangements including 1NO+1NC configurations. This modular design provides flexibility for industrial control applications, reducing the need for multiple relay types and simplifying system design and maintenance.