TS 840 TRANSFER SWITCH
PM057 REV 8 10/01/25 Thomson Technology
TABLE OF CONTENTS
1. PRODUCT REVISION HISTORY 1
2. EQUIPMENT STORAGE 1
2.1. ENVIRONMENTAL CONDITIONS 1
3. NOTES TO INSTALLER 2
3.1. UPSTREAM CIRCUIT PROTECTIVE DEVICES/ELECTRICAL CONNECTIONS 2
3.2. TRANSFER SWITCHES WITH INTEGRAL OVER CURRENT PROTECTION 3
3.3. SYSTEM PHASING-HIGH LEG DELTA SYSTEMS 4
3.4. REMOTE START CONTACT FIELD WIRING 5
3.5. DIELECTRIC TESTING 5
3.6. INSTALLATION OF OPEN TYPE TRANSFER SWITCHES 5
3.7. MOUNTING OF ENCLOSED TRANSFER SWITCHES 5
4. GENERAL DESCRIPTION 8
4.1. PRODUCT MODEL CODE 10
4.2. TYPICAL COMMISSIONING PROCEDURES 11
5. GENERAL THEORY OF OPERATION 11
5.1. STANDARD AUTOMATIC TRANSFER SWITCH 11
5.2. SERVICE ENTRANCE AUTOMATIC TRANSFER SWITCH 12
5.3. TEST MODES 16
6. OVER CURRENT PROTECTION 16
6.1. STANDARD TS 840 AUTOMATIC TRANSFER SWITCH 16
6.2. OPTIONAL TS 840 AUTOMATIC TRANSFER SWITCH WITH INTEGRAL OVER
CURRENT PROTECTION 16
7. GENERAL NOTES ON SERVICING TRANSFER SWITCH MECHANISM 18
8. TRANSFER SWITCH MECHANISM OPERATION– 100A-800A, S STYLE 20
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