Delta ASN122 Analog Input Module: Comprehensive Technical Guide

9 november 2025

Pre-shipment Inspection Record: This document details the visual and technical inspection of the Delta ASN122 Analog Input Module: Comprehensive Technical Guide. All product photos and testing videos below are original materials captured first-hand by the Koeed technical team in our warehouse prior to dispatch.

What is the IDEC ASN122 selector switch?

A correction the photos make unavoidable: despite the listing title, this is not a Delta analog input module — ASN122 is an IDEC part number, and the photographed goods are two IDEC (和泉电气) 30 mm selector switches from Japan, new in their original IDEC CONTROL UNIT boxes (ASN122 type labels, CE and the N/CCC mark). Each switch is the classic ASN1 build: a black 3-position-style knob with a white index line on a chrome bezel, an ASN shank printed ASN / JAPAN / IDEC with the 16/30 mounting note, wire spec (CONTACT 1.25 mm² × 2, USE COPPER WIRE 12–24 AWG) and the CCC mark, and contact blocks stacked on the back — IDEC BS001E blocks (A600 P600, IND. CONT. EQ. 858T, UL Listed J45446) with their brass NC or NO contacts visible. One unit is photographed with NC blocks, the other with NO blocks; match your panel's contact requirement when assigning them. New in original packaging with a one-year warranty (about 0.5 kg per the record); they passed through the Koeed warehouse on 17 October 2025, and the photos and video below show them as received.

2 min readContent reviewed 6 October 2026

Part details

IDEC ASN122 selector switch, per box label and parts
Field	Value
Manufacturer	IDEC (和泉电气) — made in Japan
Order number	ASN122 (box type label: ASN122 on the IDEC CONTROL UNIT carton)
Type	30 mm selector switch, 2-position maintained, black knob with white index, chrome bezel
Shank print	ASN / JAPAN / IDEC; 16/30 mounting note; CONTACT 1.25 mm² × 2 Lbs; USE COPPER WIRE 12-24AWG; CCC mark
Contact blocks	IDEC BS001E blocks (A600 P600, IND. CONT. EQ. 858T, UL Listed J45446); one switch fitted with NC blocks, the other with NO blocks (as photographed)
Quantity	2 switches, each in its original box
Condition	New in original packaging (per intake record); one-year warranty
Weight	About 0.5 kg (record)
Intake recorded	17 October 2025

Scroll sideways to see the full table.

About the listing title

To be explicit for anyone landing here from a search: "Delta analog input module" in the listing title does not describe this item. ASN122 belongs to IDEC's ASN1 selector-switch range, and every box, shank and contact block in the photo set is IDEC-branded — nothing Delta appears anywhere. Buyers hunting a Delta AS-series module should not order from this page; buyers replacing an IDEC selector switch have the right part — match the ASN122 order number, the knob's position count, and the contact blocks your circuit needs (swap BS-series blocks freely if your old switch carried a different NO/NC mix).

Photos and video

All images below are original warehouse photos of the exact switches covered by this record, taken before dispatch. Click any photo to view it full size.

Two selector switches knob side — Knob side, both units: black 2-position knobs with white index lines on chrome bezels, ASN / JAPAN / IDEC shank labels.

Knob close-up: the ribbed black selector with its white index line on the chrome bezel.

Both switches from above — Both from above: knobs at their left position, chrome bezels, contact stacks behind.

Contact backs NC and NO — Contact backs: the upper switch carries NC blocks (brass contacts marked NC), the lower carries NO blocks — two different contact sets, same switch type.

Back with pins — Back, single switch: the shank label and the contact-block rows below.

BS001E contact blocks — Contact blocks close-up: IDEC BS001E blocks — 1⊥2 circuit print, A600 P600, IND. CONT. EQ. 858T, UL Listed J45446, brass NC contacts and screw terminals.

Knob side second angle — Knob side, second angle: both selectors at rest position.

ASN JAPAN IDEC shank label — Shank label in full: ASN, JAPAN, IDEC, 16/30 mounting note, CONTACT 1.25mm² × 2 Lbs, USE COPPER WIRE 12-24AWG, CCC mark.

Terminal screws and position marks — Terminal backs: the screw terminals and the red/green position marks between contact rows.

Contacts second angle — Contacts, second angle: the block rows and terminal screws on both switches.

Contact rows: the stacked BS001E blocks and their brass contacts on both switches.

IDEC boxes with ASN122 labels — Both original boxes: IDEC CONTROL UNIT, CE, N/CCC mark, and the white ASN122 type labels — the identity of the parts in one photo.

Inspection video of these selector switches, recorded at the Koeed warehouse on 17 October 2025.

For another selector-side control part from the same shelf, see the Guardmaster MSR5T safety relay pair — the relay end of a selector circuit, new in box.