BS 142-3.2(1990) : 1990

Foreword
Committees responsible
Specification
1 Scope
2 Definitions
3 Standard rated values
4 Limits of the operative ranges for auxiliary
    energizing quantities
5 Thermal requirements
6 Accuracy
7 Overshoot time
8 Rated burden and rated impedance
9 Mechanical classification
10 Construction
11 Marking and data
12 Insulation
13 Additional requirements for static relays
14 Contact performance
15 Thermal tests
16 Mechanical tests
17 Accuracy tests
18 Test conditions for the measurement of overshoot
Tables
1 Preferred values of k and alpha
2 Limiting errors at defined values of characteristic
    quantity
3 Values of the characteristic quantity or input
    energizing quantity for mechanical durability tests
4 Test conditions relating to the characteristic
    quantity for determining errors relating to
    specified time
5 Initial and final values of characteristic quantity
    for measurement of overshoot
Figure
1 Curves of time against characteristic quantity,
    showing graphical representation of limiting errors

Describes requirements for single input energizing quantity measuring relays with dependent specified time as a particular sub-family of measuring relays whose general requirements are specified. Excludes thermal electrical relays. Covers definitions, standard rated values, limits of the operative ranges for auxiliary energizing quantities, thermal requirements, accuracy, overshoot time, rated burden and impedance, mechanical classification, construction, marking and data, insulation, requirements for static relays, contact performance, thermal, mechanical and accuracy tests.