What is double throw isolator and single throw Isolator.
Answer Posted / praveen kumar rai
In electronics, switches are classified according to the arrangement of their contacts. A pair of contacts is said to be "closed" when current can flow from one to the other. When the contacts are separated by an insulating air gap, they are said to be "open", and no current can flow between them at normal voltages. The terms "make" for closure of contacts and "break" for opening of contacts are also widely used.
The terms pole and throw are also used to describe switch contact variations. The number of "poles" is the number of separate circuits which are controlled by a single switch. For example, a "2-pole" switch has two separate identical sets of contacts controlled by the same switch. The number of "throws" is the number of separate wiring path choices other than "open" that the switch can adopt for each pole. A single-throw switch has one pair of contacts that can either be closed or open. A double-throw switch has a contact that can be connected to either of two other contacts, a triple-throw has a contact which can be connected to one of three other contacts, etc.[4]
In a switch where the contacts remain in one state unless actuated, such as a push-button switch, the contacts can either be normally open (abbreviated "n.o." or "no") until closed by operation of the switch, or normally closed ("n.c." or "nc") and opened by the switch action. A switch with both types of contact is called a changeover switch. These may be "make-before-break" ("MBB" or shorting) which momentarily connects both circuits, or may be "break-before-make" ("BBM" or non-shorting) which interrupts one circuit before closing the other.
These terms have given rise to abbreviations for the types of switch which are used in the electronics industry such as "single-pole, single-throw" (SPST) (the simplest type, "on or off") or "single-pole, double-throw" (SPDT), connecting either of two terminals to the common terminal.
Is This Answer Correct ? | 3 Yes | 0 No |
Post New Answer View All Answers
Give some example of fault limiting devices?
what is the difference between ups & inverter
Can anybody please refer the best and simple book for about Protection relays and in detail of all its protection ?
I am inpecting a 10kVA UPS what tests should i do and should i observe?
Where is servomechanism used?
how many types control panel of a 132/33 kv substation
it is possible to rotate the DG engine dc starter with wrong polarity connections? why?
STATE WORKING OF VACCUM CIRCUIT BRAKER?
what will happen if OLR CT in all phases are short circuted
HOW TO CALCULATE AMPs OF CURRENT TRANSFORMER IN HT Panel
When semiconductor fuse does save thyristor in each cycle of conduction? Why under voltage setting keep less in SPRS and more in DC drive?
What is the pro & con of having 11kv & 33kv incoming, and what is the adv & disadv. of converting from 11kv to 33kv.
how we provide neutral earth on synchronising panel as per electrical standards?
How to determine stage of Automatic Power factor controlling Relay(Apfcr)?
What will be in Mahagenco Trade Test Exam? I want to know the same.