Mold Components

LIMIT SWITCHES Thinswitch® Liquid-Resistant Limit Switch

LIMIT SWITCHES Thinswitch® Standard & High Temperature Limit Switches

T222LR & HT291LR MODELS SPECIFICATIONS

U.S. Patent No. 5,446,252

ELECTRICAL: 250VAC

U.S. Patents 5,446,252 and 6,982,392

5 AMPS RESISTIVE 4 AMPS INDUCTIVE (MAX) 5 AMPS RESISTIVE 4 AMPS INDUCTIVE (MAX)

28VDC (SEA LEVEL)

OPERATING TEMPERATURE: T222LR STANDARD MODEL

175°F MAX (79.4°C MAX) HT291LR HIGH TEMPERATURE MODEL 250°F MAX (121°C MAX) SWITCHING: SPDT MATERIALS BODY:

FIBERGLASS-REINFORCED NYLON

POLYURETHANE POLYESTER FILM

DOME:

BACK COVER: WIRE LEADS:

22 GA STRANDED, 3-CONDUCTOR, SHIELDED CABLE, 6 FT. (1.8M) LONG, ENDS STRIPPED AND TINNED

General Description Thinswitch ® Liquid-Resistant Limit Switch is designed to verify ejector plate return in areas where occasional water or oil spray is present. The Thinswitch helps prevent accidental mold close in injection molding applications by providing a position switch that is tied to the injection molding machine control. The liquid resistant switch uses the same mounting hole locations as the original Thinswitch. The Thinswitch has been tested for reliability over 10 million cycles without failure. Two switches can be used in series for larger molds to ensure the ejector plate return, preventing costly mold damage. Features and Benefits • Over 10 million cycle life • 175°F (79.4°C) standard temperature rating • 250°F (121°C) high-temperature unit for higher temperature needs • Adjustable actuation between .187" and .250" from the mold base • 3 ⁄ 16 " thick design fits snugly behind the ejector plate between the rest buttons • Stripped and tinned 6 ft. wire leads • Mounting screws and wire clips included

The Thinswitch ® Limit Switch is designed for use in very low power mold protection control circuits. It is not intended to switch heavy loads in power applications.

STANDARD TEMPERATURE THINSWITCH TSW2220 SP222A REPLACEMENT SPRING CT222A REPLACEMENT CABLE TAB

HIGH TEMPERATURE THINSWITCH HT291

RATED CURRENT (RESISTIVE) VS. OPERATING STEEL TEMPERATURE

The Thinswitch ® Limit Switch is specially designed to verify ejector plate return before permitting the mold to close in injection molding machines. Thin enough to fit inside the ejector housing, it can also be used for core slides, or any place space is limited. The Thinswitch Limit Switch has been tested for reliability in more than 10 million cycles without failure. Two switches can be used in series for larger molds to ensure the ejector plate returns, preventing costly mold damage. The Thinswitch Limit Switch is designed for use in very low power mold protection control circuits. It is not intended to switch heavy loads in power applications. • Prevents costly damage by ensuring the ejector assembly is fully returned • Adjustable operating point allows actuation between .187" and .250" from the base • 3 ⁄ 16 " thick design fits snugly behind the ejector plate in the space provided by the rest buttons • Included mounting hardware installs the Thinswitch Limit Switch easily • Stripped and tinned 6 ft. wire leads make the switch ready to install without modification • 175°F (79.4°C) standard temperature rating enables use for most molding applications • 250°F (121°C) high temperature unit is available for higher temperature needs • Quality tested over 10 million cycles to provide long, dependable service • Linear adjustment set screw can be set within .005 to .0025 • Premature spring and switch failure may result by adjusting the operating point more than .020" (.5mm) before the end of the ejector plate stroke • In stock to provide same-day delivery

T222LR

HT291LR

AMPS

°F 85

°C

AMPS

°F

°C

5.0 4.0 3.0 2.0

29.4 49.0 68.3 79.4

5.0 4.5 4.0 3.5

100 155 210 250

37.7 68.3 98.8

120 155 175

121.1

Thinswitch Spring Under Dome ®

6.4mm/.250in Max Actuation Height

Rest Button

Ejector Housing Base

4.8mm/.188in Min Actuation Height

38.1mm/1.50in 25.4mm/ 1.00in

6.4mm/0.25in

9.5mm/ 0.375in

31.8mm/ 1.25in

59.9mm/ 2.36in

NOTE: Design and

specifications are subject to change without notice.

Thinswitch includes 2 cable tabs.

4.8mm/ 0.188in

NOTE: P remature spring and switch failure may result by adjusting the operating point more than .020" (.5mm) before the end of the ejector plate stroke.

CABLE

DRILL AND TAP #10-24 x 3/8" DEEP TO ACCEPT #10 BUTTON HEAD SCREWS INCLUDED WITH THINSWITCH ® LIQUID RESISTANT LIMIT SWITCH

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■ ■ U.S. 800-626-6653 Canada 830807- 6600 dme@milacron.com ■ www.dme.net ■ store.dme.net

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