The Type B overload relay is designed to protect industrial motors against overload conditions. Using modern block type, bimetallic design, this relay will provide Class 20 operation in either single-phase or three-phase applications.

The Type B overload relay is a bimetallic actuated device. The bimetal elements are operated by precisely calibrated heaters. The heater elements are connected either directly in the circuit to be measured, or through current transformers on applications NEMA Size 5 and larger.

As the bimetals are heated by motor current flow, a deflection force is produced. Upon a sustained level of abnormal current flow, the deflection becomes great enough to open the snap upon contact.

The Type B ambient compensated design is supplied as standard on all A200 starters. This design uses a second compensating bimetal responsive to ambient air temperature in the surrounding enclosure. This feature reduces nuisance tripping in applications using compact control panels and motor control centers where internal temperature rise is significant compared to motor ambient temperature. The compensating characteristic is maintained in ambient temperatures from 40° to 77°C.

• Ambient compensation standard
• Alarm contact field mountable
• Class 20—600V design
• Inverse time delay trip
• Test trip device for weld check
• Hi-visibility up-front trip indication
• Trip-free reset mechanism

The Type A overload relay is designed to protect industrial motors against overload conditions. Using modern block type, bimetallic design, this relay will provide Class 20 operation in either singleor three-phase applications.

• Field selectable manual/auto reset
• Alarm contract factory available
• Class 20—600V design
• Inverse time delay trip
• Adjustable trip rating ±15%
• Color coded reset rod:
  • Compensated (gray)
  • Non-compensated (red)

The Type A overload relay is a bimetallic actuated device. The bimetal elements are operated by precisely calibrated heaters. The heater elements are connected either directly in the circuit to be measured, or through current transformers on applications NEMA Size 5 and larger.

As the bimetals are heated by motor current flow, a deflection force is produced. Upon a sustained level of abnormal current flow, the deflection becomes great enough to open the snap action output contact.

The Type A overload relay can be supplied as an option on all A200 starters to provide automatic reset operation. The overload relay is always shipped in the non-automatic mode. To set up auto operation, reposition the reset rod by loosening and retightening a hold-down clamp at the base of overload relay.

The Type FT overload relay is designed to protect special purpose motors having restricted thermal and locked rotor capabilities. Using modern block type, bimetallic design, this relay will provide Class 10 operation in singleor three-phase applications.

• Class 10—600V design
• Inverse time delay trip
• Color coded reset rod—green
• Alarm contact factory available
• Field selectable manual/auto reset
• Adjustable trip rating ±20%
• Ambient compensation included

The Type FT overload relay is a bimetallic actuated device. The bimetal elements are operated directly from line current, thus separate calibrating heater elements are not utilized. The overload relay may be wired directly in the motor circuit, or throughcurrent transformers on applications larger than 150A.

As the bimetals are heated by motor current flow, a deflection force is produced. Upon a sustained level of abnormal current flow, the deflection becomes great enough to open the snap action output contact.

The IQ500 is a heaterless, current-sensing, solid-state motor protective relay with optional communications capabilities. Several functions are incorporated into the base relay (IQ502/IQ504) as standard:

• Overload (overcurrent) protection
• Phase unbalance and phase loss protection
• Ground current protection (Class II)

The base relay can serve as the initial building block for a motor protection system by adding the IQ500M Special Function Module. The module can address application related motor load functions with the additional features:

• Underload protection
• Long acceleration
• Load control

The IQ500 can provide a cost effective alternative to conventional protective relays such as current relays, ground fault relays and phase loss or phase unbalance relays. Used with the PowerNet system, a lowcost, local area communication network, information such as current values, status, setpoint values and cause of trip can be displayed remotely. The IQ500 relay is ideal for a variety of industrial applications such as mining, timber, material handling, air conditioning compressors, wastewater treatment plants and petrochemical industries.

• UL File No. E19223

• Overload class is adjustable using DIP switches for 5, 10, 20 or 30 seconds, maximum trip times at six times rated current
• Designed for 1000V and less distribution systems
• Form C (NO/NC) contact on output relay
• Isolated alarm relay output contact
• Communications capability using IMPACC network
• Manual or automatic reset (either a true manual or remote electrical reset)—selectable
• Overload, Class II ground current, phase unbalance and single-phase protection are standard
• LED indication (bicolored—red/green) for device status, including overload, phase unbalance or ground current trip
• Special Function Module adds protection for underload and jam conditions, also provides for long acceleration
• Optional load control feature available with special function module
• Feed-through current transformer windows for contactors, NEMA Sizes 1– 4 (for Size 5 and larger, external current transformers can be used)

• Fits mounting footprint of Eaton’s MORA relay
• Panel or starter mountable
• Cause of trip is held in memory through a power loss
• Bell alarm contact available for remote status indication
• DIP switch provided for setting operating frequency—50 or 60 Hz
• Plug-in terminal block for control power, trip relay and bell alarm relay connections
• Operating temperature: –20° to 60° C (–4° to 140°F)

• No external current transformers are required since they are internal to the IQ500
• DIP switches used to select functions and settings on base relay are clearly marked and covered with screw-on plastic covers
• On the automatic reset, the reset times can be selected for long (90 second) or short (10 second) delay
• Device can be set for different motor full load currents without additional parts or modules

• With the addition of the IQ500M Special Function Module, the enhanced protection includes jam (overtorque) and underload and provides long acceleration time (high inertia load)
• The underload and jam protection functions each have independent Form C output relays as part of the module. In addition, the underload and jam functions each have their own LEDs for status indication
• The underload and jam functions also have separate selectable trip levels and adjustable tripdelay and start-delay settings
• The IQ500M can be used as a load control module that allows “shedding and restoring” a particular load that contributes to the load being monitored
• The PONI (Product Operated Network Interface) card attaches directly to the base relay or special function module for interfacing with the Eaton’s PowerNet communications system
• Localized display can be achieved with the Central Monitoring Unit