ABB 704.910.4 position switch

300-line overload relays

Broad selection for positive motor protection

The 300-line three-leg block overload relay includes features that provide positive motor

protection and added operator safety.

±10% adjustment: Relay trip points are factory calibrated for high accuracy. For added flexibility,

the trip current of the relay is adjustable ±10% to allow tuning the protection to any given motor

current and to eliminate nuisance tripping. A single calibration adjusts all three legs. The overload

relay is available in standard or ambient- compensated forms.

The CR324X solid-state overload relay provides added motor protection in critical

production processes where uptime is vital. It mounts directly to 300-line starters, and a

panel-mount version is also available for added application flexibility. Its advanced features can

save you time and money:

• Heaters are eliminated

• Phase loss protection prolongs motor life under adverse conditions

• Solid-state surface-mount technology increases reliability, offers excellent vibration resistance

and reduces heat generation

• Selectable 10/20/30 trip class offers flexibility for a range of applications

Accessories

Meet your special operating needs

ABB offers a large selection of accessories that allow you to extend the application

of your 300-line starters to match your operating needs.

Auxiliary contact kits deliver added versatility to magnetic starters

• Provide additional control circuits to energize accessory equipment, such as indicating lights

or to control sequencing of other motor starters

• Can be added to all across-the-line magnetic starters, reversing controllers and two-speed

controllers

• Each auxiliary contact rated at 10 amperes AC,continuous current (NEMA A600), and is suitable

for right or left side mounting

• Kits include either a basic contact block or an adder block supplied with a single or double circuit

For low voltage applications

• High fidelity auxiliary contacts for applications where it is necessary to detect starter or

contactor operation with circuits that use low voltage levels, such as programmable

controls or computer systems

• Control amplifier is available for applications with low level 24 V DC outputs to operate 300-line

contactor and starter control coils at line voltag Coil kits adapt for different voltages

• Encapsulated coils in kit form enable you to change contactor coils for different voltages

• Coils are rated up to 600 volts, 50 and 60 hertz

• Coil changes are quick and easy

Surge suppression kits provide protection and are designed to meet the demands of

solid-state circuitry

• Prevent undesirable reactions in logic circuits by using an RC network to absorb energy surges

from opening the coil circuit

• Eliminate the need to install a separate resistor and capacitor network

• Easy to install and requires only one wire connection — the mounting plate makes the other

electrical connection

• Unit installs neatly on the contactor coilretaining clip