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Reed relays
One or more reed switches inside a coil is a reed relay. Reed relays are used when operating currents are relatively low, and offer high operating speed, good performance with very small currents which are not reliably switched by convention... [read more]
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Reed Switch
Reed Switch The reed switch is an electrical switch operated by an applied magnetic field. It was invented at Bell Telephone Laboratories in 1936 by W. B. Ellwood. It consists of a pair of contacts on ferrous metal reeds in a hermetically se... [read more]
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Description of Reed Switch
The reed switch contains a pair (or more) of magnetizable, flexible, metal reeds whose end portions are separated by a small gap when the switch is open. The reeds are hermetically sealed in opposite ends of a tubular glass envelope.... [read more]
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IP Protection Classes
IP Protection Classes The protection classes outlined in the IP standard EN 60529 describe how devices are protected from the entry of foreign bodies and moisture. The identification is given in a key, which consists of the two letters IP fo... [read more]
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Types of Electrical Contacts
Types of Electrical Contacts... [read more]
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Type 7 Arc snuffing
7. Arc snuffing A high-voltage switch employing SF6 as an insulating medium In high current and high voltage applications a secondary contact may be used to transfer load to a load break mechanism in order to avoid arcing wear and tear of t... [read more]
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Type 6 Electrical ratings
Contacts are rated for the current carrying capacity while closed and the voltage breaking capacity when opening (due to arcing) or while open.... [read more]
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Type 5 Bifurcated contact
A bifurcated contact is a contact whereby each contact arm splits into two smaller arms each with its own contact bump. Only one electrical circuit can be used for this arrangement.... [read more]
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Type 4 Contact wipe
Type 4 Contact wipe Contact wipe is an action designed into a contact so that the contact motion exceeds the initial electrical contact touch point.... [read more]
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Type 3 Latching state devices
Latching state devices Where the state of the operating device can be latched in either state and therefore the normal state is not clearly defined a different style of contact definitions may be used.... [read more]