Switching and Protection Products Guides

Name: Welibaba
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Page 3: 55 technical guides for choosing Switching and Protection Products products: selection criteria, standards, common mistakes and frequently asked questions.

Relays Selection Guide — Covers residual current, thermal, protection, timer, automation and reactive power control relays; choose by what the relay measures and its function.
Cam Switches Selection Guide — Cam switches are switches whose position is selected by turning the handle; on-off, step, reversing, star-delta and Dahlander types are chosen by the job.
Blade Fuses Selection Guide — For a blade fuse, the frame size determines the base the fuse link fits; the size, rated current and duty class must be read correctly when choosing.
Thermal Overload Relays Selection Guide — A thermal overload relay senses the motor's overload current and drops out the contactor; selection looks at bimetal or electronic construction, scale range and contacts.
Miniature Circuit Breakers Selection Guide — On a miniature circuit breaker, the curve letter sets the magnetic tripping threshold: B 3-5, C 5-10, D 10-20 In; check tripping curve and breaking capacity.
Motor Protection Circuit Breakers Selection Guide — A motor protection circuit breaker opens all poles together on overload with a bimetal and clears a short circuit with magnetic tripping; when choosing, look at the setting range, Ii, Icu and Ics.
Switching and Protection Products Selection Guide — Switching and protection devices do different jobs in a panel and are not interchangeable; overload, leakage current, overvoltage and arc faults are covered separately.