SPECIFICATION SHEET The 375 finned strip heater from Watlow® is constructed of highly-compacted magnesium oxide (MgO) based insulation, which conducts heat efficiently from the nickel chromium element wire to the sheath. Two-inch wide (51 mm) nickel plated fins are attached to maximize surface contact allowing heat to transfer into the air faster. Lower sheath temperature and element life are maximized by this finned construction. • Aluminized steel sheath temperatures up to 1100°F (595°C) Nickel-chromium element wire is centered in the heater • Ensures uniform heat Aluminized steel sheath • Operates at higher temperatures and resists corrosion better than iron-sheathed heaters Optional 430 stainless steel sheath • Provides a durable solution for highly-corrosive environments Welded post terminals • Produces strong, trouble-free connections Available lengths from 51/2 to 48 in. (140 to 1220 mm) • Fits a variety of application needs Typical Applications • Enclosure heating • Load bank resistors • Shrink tunnels • Duct heaters • Space heaters • Drying ovens • Heat curing • Food warmers • Moisture protection • Stress relieving ovens

Technical Information Calculating Watt Density Use the graph and formulas to ensure the maximum allowable watt density for the heater is not exceeded in the application. Open air watt density is calculated for the total heated surface area. Wattage Heated Area Heated Area (Offset Terminals) = = [Overall Length (A) - 4 in.] x 3.75 in. [Overall Length (A) - 102 mm] x 95.3 mm Heated Area (Parallel Terminals) = [Overall Length (A) - 3.12 in.] x 3.75 in. = [Overall Length (A) - 79.3 mm] x 95.3 mm Heated Area (One-on-One Terminals) = = [Overall Length (A) - 4.25 in.] x 3.75 in. [Overall Length (A)...

Heated Length Termination Options Offset Terminals One-on-One Terminals 10-24 Threaded Terminals 10-24 Threaded Terminals 7⁄8 in. (22.2 mm) 5⁄16 x 1⁄2 in. (7.94 x 13 mm) Mounting Slots 5⁄16 x 1⁄2 in. (7.94 x 13 mm) Heated Length Mounting Slots Two 10-24 threaded post terminals are offset from each 23⁄4 in. 11⁄4 in. Heated Length mm) end. other on the (70 same (32 mm) Typ. Parallel Terminals Two 10-24 threaded post terminals are placed one on each end. In-Line Terminals 13⁄8 in. (34.9 mm) 7⁄8 in. 3⁄8 in. (22.2 mm) (9.5 mm) 2 in. A (50.8 mm) 1⁄2 in. (13 mm) 5⁄16 x 1⁄2 in. (7.9 x 13 mm) 11⁄4 in....

Termination Options (Con’t) Metallic Terminal Boxes - Variations 0.020 Tk. 5 Fins Per Inch " 11/2" boxes7/8are Metallic terminal available from stock on offset (38.1 mm) (22.2 mm) terminals. Terminal boxes act as a safety feature by 3/8" (9.5 mm) covering the terminals. A conduit may be attached to 7 11/2" box the 3/4" through /8 in. (22.2 mm) diameter holes in the (38.1 mm)(19 mm) ends of the box. To order, specify terminal box. Available on offset terminals from stock and manufactured. on in-line terminals only. Accessories Secondary Insulation Bushings Ceramic Terminal Covers 1 4 in.-20 x...