ABB Ti4-ex Ai950s S900 Temperature Input Ti4-Ex No. AI950 Module
General
The T1 breaker family ranges from 15 through 100 amperes. The T1 trip units are non-interchangeable and use the very latest technology in electromagnetic relays for overcurrent trip protection. Thermal overload protection is provided by heat sensitive bimetals. Short circuit protection for the breaker is accomplished using a precise magnetic coil. State-of-the-art construction in contacts and arcing chambers aid in limiting damaging fault currents through the protected circuits.
Molded case switches
UL489 switches include no overcurrent protection except for a high instantaneous trip mechanism for self-protection.
Standards
The UL489/CSA 22.2 version of T1 also carries an IEC-60947-2 rating.
The validity of the electrical installation handbook
Some tables show approximate values due to the generalization of the selection process, for example, those regarding the constructional characteristics of electrical machinery. In every case, where possible, correction factors are given for actual conditions which may differ from the assumed ones. The tables are always drawn up conservatively,
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