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Control Panel and Enclosure Heating

Chromalox Electric Heaters and Controls
Mor Electric Heating is an authorized distributor for Chromalox®

Chromalox SBKT Control Panel Thermostat

The SBKT Thermostat is designed for control of temperature in instrument control cabinets. The thermostat assembly consists of a Therm-O-DiskTM Model 36TX11 Thermostat (5/8" disk) mounted on an oval bracket. The thermostat has tabs for wiring terminals.


Current Voltage
Ratings (Resistive)
15A @ 120V
                                            10.5A @ 240V
                                            9.3A @ 277V
Ambient Temperature .......... 350°F Max

Note: Leads and mounting hardware provided to mount on Chromalox Strip Heaters.

Chromalox® OT Strip Heaters

All dimensions in inches

Chromalox Installation Instructions
Chromalox Specification Data Sheet for Selection of Heaters

You must have the free Adobe Acrobat Reader plug-in.


OT-AC-1 (Protective Terminal Cover)

A = 2", B= 2 1/2", C = 2 1/2"

Control Panel Heating (Typically The Panels Are Located Outdoors and Require Heating)


1). Calculate the total enclosure surface area in Square Inches.
2). Determine the temperature rise above ambient required (Temperature Gradient).
3). Using the graph below determine the heat loss in Watt/Sq.In..

Uninsulated Enclosure Heat Loss:

4). Multiply the total surface area by the heat loss to determine the total wattage required.

Note: Subtract the wattage from internal control panel components from the total heat loss wattage required to determine the appropriate heating element wattage required.

5). Select an appropriately sized Chromalox strip heater.
6). Select an appropriate Chromalox SBKT thermostat assembly kit.

Chromalox SL-B Flexible Silicone Rubber Insulated Enclosure & Air Heater

• All Models Stocked
• 25, 50, 100 and 250 Watts
• 120 Volts
• Vulcanized to Mounting Plate for Easy Installation
• Custom Design and Thermostats Available
• Air Temperature Sensing Thermostats (40F close, 60F open) available

Type SL-B Silicone Rubber Insulated Enclosure Heaters and General Purpose Air Heaters are used for freeze protection and condensate protection in electrical enclosures. They are also installed in equipment to keep mechanical components functioning in applications such as ATM machines and automatic doors. Shipment can be made within 24 hours from receipt of order.

• 10" Lead Length is standard
• 25, 50, 100 and 250 watt heaters available with or without integral air temperature sensing thermostat.
• All stock heaters operate on 120V. Heaters requiring other voltages up to 600V are available as non-stock items however special thermostats with be required.
• Easy installation. Consult Chromalox with Bracket and Mounting Slots
• Integral or remote air temperature sensing thermostats ensure heater operation in condensation forming and other air heating application conditions.

Freeze or condensation protection in enclosures containing electronic equipment, such as: Temperature Control Panels, Control Valve Housings, ATMs, Traffic Signal Boxes. Also, General Purpose Air Heating applications.

The SL-B enclosure heaters are factory vulcanized to an aluminum mounting plate that allows for easy installation. The mounting surface is perpendicular to the heater and has two tapped mounting Holes. If using the heater with the integral thermostat, vertical mounting with the sensor towards the base of the enclosure is recommended.

Chromalox SCB Edison Screw Base Space Heater

• Edison Screw Base
• 50 - 200 Watts
• 120 and 240 Volt
• Brass Sheath

Edison Screw Base installs in standard porcelain lamp socket for simple installation. Prevent moisture accumulation, mildew and freezing in clothes lockers, fire extinguisher cabinets and control boxes. Also used in resistor banks.

Chromalox® is a registered trademark.

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We are a Distributor of Residential, Industrial and Commercial Heaters and Controls. Always consult manufacturers installation instructions for proper installation of the products or systems shown on this website. © Copyright 1999-2013 Mor Electric Heating Assoc., Inc.

5880 Alpine Ave. NW - Comstock Park, MI 49321  USA
Tel 616-784-1121 - 800-442-2581 - Fax 616-784-7775

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