TESCO Test Switch Adapters Catalog No. 290
The TESCO Test Switch Adapters (Catalog No. 290) provide a safe, portable solution for testing transformer-rated meter sites that lack a permanent test switch. Designed to work seamlessly with the TESCO 6330 Meter Site Analyzer, these adapters plug directly into the meter socket to instantly create a secure, test-ready interface. By replicating the correct terminal layout for specific meter forms, the Test Switch Adapters allow utilities and field crews to run accuracy, burden, and in-service tests without panel modifications or permanent installations. Their compact design makes them ideal for field use, improving efficiency while minimizing the risk of CT secondary opening or wiring errors. • Plugs directly into meter socket for instant test-ready connection • No permanent wiring or panel modifications required • Compact and portable design for on-site meter accuracy and burden testing • Improves safety by reducing CT secondary opening risks • Compatible with TESCO 6330 Meter Site Analyzer
TEST SWITCH ADAPTER CATALOG NO. 290-13T
Catalog No. 290-13T 290-8T 290-6T3S 290-6T4S
Meter Form 9S/8S/6S
Use Case
Full-feature 13-terminal adapter
5S 3S 4S
8-terminal adapter
6-terminal adapter (3S layout) 6-terminal adapter (4S layout)
TEST SWITCH ADAPTER CATALOG NO. 290-13T
TEST SWITCH ADAPTER CATALOG NO. 290-6T3S
TEST SWITCH ADAPTER CATALOG NO. 290-64S
TESCO Metering 925 Canal Street · Bristol, PA 19007 · Phone: 215.228.0500 tescometering.com
2026 V1
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