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White rectangular keypad with twelve buttons on a stainless steel single-gang plate

Linear

Linear 212I 12-button keypad access device

SKU CH-H3F2-BN2M0

A 12-button indoor flush-mounted keypad supporting up to 120 user codes with auto-adjusting 12 to 24 VAC/DC input and SPDT relay output

  • TypeKeypad Access Device
  • 12-button keypad supports up to 120 user codes
  • Auto-adjusting 12-24 VAC/DC input simplifies installation
  • SPDT relay rated 5 A handles door strikes directly
  • Indoor flush-mount stainless-steel plate fits single-gang box
  • Operating range 20 °F to 130 °F suits varied climates

Indoor flush-mount keypad

The Linear 212I is a twelve-button access keypad designed for indoor flush mounting. It accepts twelve to twenty-four volts AC or DC with auto-adjusting input and provides a single-pole double-throw relay rated at five amps. The unit stores up to 120 user codes and operates between twenty and 130 degrees Fahrenheit.

Replaces standalone code entry units

This device upgrades installations that rely on simple push-button switches or key-operated locks by adding programmable codes and a relay output. The jump is worth it when you need audit-capable access control without a separate controller or when the existing hardware lacks the 120-code capacity.

Fits standard single-gang boxes

Installation uses a stainless-steel single-gang plate with plastic buttons that matches common wall boxes. The SPDT relay wiring follows typical access-control conventions, so miswiring the common, normally-open or normally-closed terminals is the most frequent error.

Highlights

  • 12-button keypad supports up to 120 user codes
  • Auto-adjusting 12-24 VAC/DC input simplifies installation
  • SPDT relay rated 5 A handles door strikes directly
  • Indoor flush-mount stainless-steel plate fits single-gang box
  • Operating range 20 °F to 130 °F suits varied climates

Specifications

BrandLinear
Model212I
TypeKeypad Access Device

Questions about this item

What size wall opening does the 212I keypad require for flush mounting?

The unit fits a standard single-gang box measuring 2-3/4 inches wide by 4-1/2 inches high with a depth of 1-1/3 inches.

Which wiring step is most often missed when connecting the 12 to 24VAC/DC input?

Installers frequently forget that the supply is auto-adjusting and must be connected to both the VAC and VDC terminals for proper operation.

How many user codes can be stored before the 212I needs a full reset?

The keypad holds up to 120 codes; once that limit is reached the memory must be cleared and all codes re-entered.

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