Metravi ST-09B Socket Polarity and Earth Leakage Tester

A. Product Overview

The Metravi ST-09B is a compact socket tester designed to quickly identify socket wiring problems. It is used by directly plugging the tester into a socket to check whether the wiring connection is correct or faulty. The catalogue mentions that it works on AC 230V, 50Hz to 60Hz and supports leakage testing of about 30mA for the ST-09B model.

B. Working Principle

The tester checks the live, neutral and earth connections of a socket. Once plugged in, the indicator lights show different combinations for correct wiring, missing earth, live-earth reverse, live-neutral reverse and missing neutral. In the ST-09B model, leakage testing can also be performed to check earth leakage protection.

C. Why It Is Used

It is used to quickly confirm whether a socket is wired safely before connecting electrical equipment. It helps detect common socket wiring faults, reduce electrical safety risk, support maintenance checks and verify basic earthing condition in homes, offices, factories, panels and commercial buildings.

D. Suitable Buyers

Suitable buyers include electricians, electrical contractors, maintenance engineers, facility management teams, safety inspection teams, industrial plants, commercial building operators, panel builders, service technicians and testing professionals.

FAQ

Q1. What is Metravi ST-09B used for?
It is used for checking socket polarity, wiring faults and earth leakage condition in electrical sockets.

Q2. What voltage does the ST-09B support?
It supports AC 230V with ±10 percent tolerance and 50Hz to 60Hz frequency.

Q3. Can it detect missing earth?
Yes, the tester can indicate missing earth condition through its LED indication pattern.

Q4. Does ST-09B have leakage test function?
Yes, the ST-09B supports leakage testing of about 30mA.

Q5. Can it detect live and neutral reverse?
Yes, it can indicate live-neutral reverse wiring condition.

Q6. Can it detect earth-neutral reverse?
No, the catalogue states that this unit will not detect earth-neutral reverse.

Q7. Who should use this tester?
Electricians, maintenance technicians, facility teams and electrical safety inspectors can use it for quick socket checking.