Auxiliary contacts on a motor starter

Perhaps the most common industrial use for contactors is the control of electric motors. The motor starter closes the auxiliary contact when energize causing a. For Use With: All NEMA Motor Logic Starters. Another feature of the motor starter is the auxiliary contact , which is normally used in the control circuit. Auxiliary Contact , -, All NEMA Motor .

In some small starters, an additional load contact can be used instead.

Reversing and multispeed motor starters are specialized .

These contacts are available in every contactor . The terminals where the motor is connected are identified as terminals T T and Tin the electrical diagram, and they are identified as load-side terminals at the bottom of the motor starter. Apart from optional auxiliary low-current contacts , contactors are almost exclusively fitted with normally open (form A) contacts. Unlike relays, contactors are designed with features to control and suppress the arc produced when interrupting heavy motor currents.

When current passes through the electromagnet, a magnetic . Full-voltage non-reversing 3-phase motors. The following diagram depicts 3- phase non-reversing motor control with VDC control voltage and manual operation. In retrofit situations, it is common to leave the existing motor starter in place to avoid the need to rewire the.

If the existing motor starter is left inplace, it should be on the input side of the drive.

One of the main uses of auxiliary contacts is the electrical retainer circuit. Another common function of these contacts is remote status and trip indication. A separate, low voltage circuit is . Contactors can be provided with auxiliary contacts (either normally open or normally closed) to . This a and b notation holds true for auxiliary contactors and relays , as well as the main contactor.

CL contactors to form integrated solutions. A full complement of accessories create solutions for all types of applications. You can choose from frontal auxiliary and alarm contacts , lateral auxiliary . Side or top mounted auxiliary contact (s).

Separate mounting unit for overloads. Direct adaptor bridge for manual motor starter and mini-contactor. Mounting unit for manual motor starter, direct adaptor bridge and . This type of motor starter will usually have an auxiliary contact switch: a smaller set of contacts that opens or closes along with the motion of the main contactors.

Latching means that the auxiliary . The auxiliary contacts operate control devices that usually, but not always, are related to motor operation. Check the control voltage that powers the coil to ensure the problem is in the motor starter and not in the power source. These parallel auxiliary contacts are sometimes referred to as seal-in contacts, the word “seal” meaning essentially the same thing as the word latch.

As the circuit exists right now, the motor will run either forward or backward once the corresponding pushbutton . Built-in heater and magnetic trip elements to protect the motor. Adjustment dial for setting motor FLA. Terminal types available: ❑ Screw terminals.

Accessories include: ❑ Front and side auxiliary contacts. Short-circuit alarm contact block. The manual motor starter is suitable for three- and single-phase applications.

Heater Selection Tables: See pages 1-1to 1-159.

CR30 CR3Magnetic Starters. Nonreversing, Non -combination. NEMA Sizes 00-with Thermal Overload Relay. The contactor range includes minicontactors from 2.