1 pcs
Mininum order quantity from 1PCS U989
Mininum order value from 1USD
2 days
lead time of U989 is from 2 to 5 days
12 hours
Fast quotation of U989 within 12 hours
60 days
60 days full quality warranty of U989
1, we will give you new and original parts with factory sealed package
2, Quality warranted: All products have to be passed our Quality Control before delivery.
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Switch Contact Ratings
Switch contacts are rated with a maximum voltage and current, and there may be different ratings for AC and DC. The AC values are higher because the current falls to zero many times each second and an arc is less likely to form across the switch contacts. U989 APEM Components SWITCH HARDWARE
For low voltage electronics projects the voltage rating will not matter, but you may need to check the current rating. The maximum current is less for inductive loads (coils and motors) because they cause more sparking at the contacts when switched off. U989 APEM Components SWITCH HARDWARE
Switch Contacts
Several terms are used to describe switch contacts: U989 APEM Components SWITCH HARDWARE
Closed - on position, contacts conducting, there may be several on positions.
For example: the simplest on-off switch has one set of contacts (single pole) and one switching position which conducts (single throw). The switch mechanism has two positions: open (off) and closed (on), but it is called 'single throw' because only one position conducts.
Way - number of conducting positions, three or more. U989 APEM Components SWITCH HARDWARE
Momentary - switch returns to its normal position when released.
Open - off position, contacts not conducting. U989 APEM Components SWITCH HARDWARE
Pole - number of switch contact sets. U989 APEM Components SWITCH HARDWARE
Throw - number of conducting positions, single or double.