870 Series Contactor Control Panel

The 870 Series Contactor Temperature Control panel is ON/OFF process temperature control and is recommended for applications that do not demand precise temperature control. Systems with two or more heating stages utilize an electronic sequencer (step controller) driven by a proportional output temperature controller to minimize the amount of load cycling while providing good temperature control. The panel is completely assembled, pre-wired, tested, and ready for trouble-free installation and operation. This is designed for use in industrial environments and outdoor installations.


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Standard Features

UL Listed/CSA Approved

NEMA 4/12 Painted Steel Enclosure1

PID self-tuning temperature controller (adjustable process temperature, with thermocouple input)

Over-temperature controller (adjustable temperature limit with thermocouple input)

Disconnecting 50 Amp Contactor for Resistive Loads (per circuit)

120 VAC control power transformer with primary and secondary fusing

Power circuit fusing

Microprocessor-based sequencer (for panels with two or more heating stages)

Door interlock disconnect switch

Manual reset pushbutton with built-in pilot light (red) for “OVER-TEMPERATURE” alarm

Selector Switch – ON/OFF with built-in pilot light (green) for “POWER ON” indication

Terminals for customer supplied remote interlock

Wiring diagram permanently affixed to the inside of the cover

Optional Features

Control Relays
These relays are activated by safety devices, such as a flow switch or remote shutoff.

Indicator Lights
Additional indicator lights may be specified for visual indication of system status, such as “LOW TEMPERATURE”.

Audible Alarm Package
Includes a horn, pilot light, latching relay and a push button for silencing the horn.

Low Liquid Cutoff
The relay is mounted and wired with sensing probe shipped loose for field installation.

Motor Starter
 This package consists of a motor starter for pump motor start-up. Motor starter is internally mounted and field connected to the pump motor.

Special Controllers
The customer may specify the use of special process or over-temperature controllers for a different temperature range, sensor input, control mode, etc.

Panel Heater
A heater and thermostat are provided to prevent condensation and maintain minimum ambient temperature for electrical components.

Wire Markers
Identification markers are attached to both ends of all control and power wires.

Tagging of Internal Parts
Permanent tags are attached to the subpanel near internal parts and marked with component titles as noted on the wiring diagram.

Explosion-Resistant Panel
A cast aluminum enclosure is rated for Class I, Groups C & D and Class II, Groups E, F & G (NEMA 7, 9).

Purged Panels
Type Z for Class I, Division 2 areas; Type X for Class I, Division 1 areas

Special Coatings
Epoxy or other paints may be specified.

Stainless Steel Panel Enclosure (NEMA 4X)
This construction provides extra corrosion resistance for harsh environments1

(1) Agency listed for NEMA 4 only.

Ordering Information

Build your catalog number

Catalog Contactor Control Panels

Max KW 240/3 Max KW 480/3 No. of Circuits Amps Per Circuit Catalog Number with Maximum Amps Dimensions (Inches) Estimated
Weight (lbs)
240V/3PH 480V/3PH Height Width Depth
19 39 1 48 AT-870-UC0048BK AT-870-UC0048BU 24 24 8 90
39 79 2 48 AT-870-UC0096BK AT-870-UC0096BU 30 30 8 140
59 119 3 48 AT-870-UC0144BK AT-870-UC0144BU 36 30 8 165
79 159 4 48 AT-870-UC0172BK AT-870-UC0172BU 42 30 8 180
99 199 5 48 AT-870-UC0240BK AT-870-UC0240BU 48 36 8 270
119 239 6 48 AT-870-UC0288BK AT-870-UC0288BU 48 36 8 275
139 279 7 48 AT-870-UC0336BK AT-870-UC0336BU 60 36 12 345
159 319 8 48 AT-870-UC0384BK AT-870-UC0384BU 60 36 12 350
179 359 9 48 AT-870-UC0432BK AT-870-UC0432BU *60 48 12 630
199 399 10 48 AT-870-UC0480BK AT-870-UC0480BU *60 48 12 635
219 438 11 48 AT-870-UC0528BK AT-870-UC0528BU *60 60 12 720
239 478 12 48 AT-870-UC0576BK AT-870-UC0576BU *60 60 12 725

*These panels have double doors and 12” high floor stands.


Closed Tank Heating

Watt Density

Percentage of Wattage

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heating solution?

Discuss your project in detail with one of our Application Engineers and they will provide a heating solution perfectly suited to the needs of your application, as well as your budget. Contact us today!

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