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Omron D4ER1A21N — Limit Switches

Omron D4ER1A21N Limit Switch, Roller Plunger, 1NO/1NC, IP67

MPND4ER1A21N

Omron D4E-N series, D4ER1A21N, limit switch with roller plunger actuator, 1NO+1NC contacts, screw terminals, IP67, 250 VAC insulation voltage, 1 A / 30 VDC switching.

$31.50Ref. price · indicative, final on quote
Omron D4ER1A21N datasheet (PDF)
Source DocumentedChannel stated on listing & quote
Condition PhotosReal unit photos / video on request
WhatsApp AnswersFast human replies for machine-down parts
Worldwide DispatchDHL/FedEx — transit quoted per order
Independent China distributor & sourcing agent· Listing updated Sep 2026

Specifications

D4ER1A21N specifications
ParameterValue
SeriesD4E-N
ActuationRoller Plunger
Termination typeScrew Terminal
Insulation voltage250 VAC
Switching voltage - DC30 V
Switching current - DC1 A
Contact configuration1NO;1NC
Operating force11.8 N
IP ratingIP67

Product details

The Omron D4ER1A21N is a limit switch from the D4E-N series, fitted with a roller plunger actuator that requires 11.8 N to operate. The contact block gives you one normally-open and one normally-closed set (1NO+1NC), terminated via screw terminals. Rated insulation voltage is 250 VAC; for DC loads it switches up to 1 A at 30 VDC.

Where it goes and why it matters

IP67 rating means the switch body and the roller plunger seal against washdown and dust ingress — it lives on a machine frame or conveyor line where coolant, washdown, or outdoor exposure is routine. The screw terminals simplify field wiring; no special tooling needed. Roller plunger suits cam-actuated or slide-actuated positions where the actuator follows the motion rather than taking a direct head-on hit.

Frequently asked questions

What is the D4ER1A21N's actuator type and operating force?

It uses a roller plunger actuator with an operating force of 11.8 N. The roller follows cam or slide motion, reducing wear compared to a straight plunger on angled surfaces.

Where can I buy D4ER1A21N and how is it quoted?

The D4ER1A21N is sourced to order through independent distribution. Submit an RFQ for current pricing and availability — lead time and stock levels are confirmed at quote time.

What is the closest alternative to D4ER1A21N in the D4E-N family?

Within the D4E-N series, the closest functional peer would share the same roller plunger actuator and 1NO+1NC contact arrangement. The deciding difference is usually the operating force or the termination style — verify the specific order code against your application's force and wiring requirements.

What compliance documentation does Omron provide for D4ER1A21N?

Omron typically provides a declaration of conformity covering the applicable EU directives (CE marking) and a RoHS compliance certificate for the D4E-N series. For specific documentation (UL, REACH, IEC) tied to this order code, request the compliance pack at quote time.

MPN
D4ER1A21N