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STS Defence
Sole Licensee GEC-General Signal/Alstom
Type Z Miniature plug-in Relays
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STS is sole licensee for the comprehensive range of Z-type high reliability signalling relays previously manufactured by GEC, Alstom or General Signals. STS can either replace relays or can repair existing units. The range of relays and associated equipment is produced in a single uniform size. The relays can provide a maximum of 16 independent combinations in either a single or twin relay form. The relay comprises a one-piece black moulded base with a transparent polycarbonate moulded cover, secured by 2 screws with provision for sealing. A paper test label is fixed on the front cover: this information will be needed in order to determine the replacement to be ordered. |
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Table of equivalents
| Single Relay | Twin Relay | |
| Type ZB | Polar sensitive | Type ZN |
| Type ZP | Double wound | Type ZL |
| Type ZS | Neutral | Type ZH |