What an Auxiliary Contact Block Actually Does
An auxiliary contact block does not switch the load. It mirrors the contactor’s state as a low-current signal so a control circuit, a relay or a PLC input can see what the main contacts are doing. That distinction is the whole reason aux blocks are ordered separately: they are sensing hardware, not power hardware.
For a distributor, this creates a reliable ordering pattern, because the aux block count on a panel usually exceeds the contactor count.
1NO / 1NC / 2NO: What Each Gives the Control Circuit
| Configuration | What it gives | Typical use |
|---|---|---|
| 1NO | Signals that the contactor has energised | PLC input, status lamp, run feedback |
| 1NC | Signals that the contactor has dropped out | Stop feedback, interlock chain |
| 1NO + 1NC | Both states from one block | The common general-purpose configuration |
| Mirror NC | Mechanically linked; will not close if main contacts are welded | Required for safety circuits and diagnostics |
Mirror Contacts and Why Safety Circuits Ask for Them
A mirror contact is a normally-closed auxiliary contact that is mechanically linked to the main power contacts. It will not close unless the main contacts are open — which means a control circuit can positively verify that a contactor has actually dropped out, rather than inferring it from a coil signal.
That verification matters on any circuit where a welded main contact is a hazard: machine guards, elevator doors, and emergency-stop chains. When a specification says “mirror contact”, a standard NC auxiliary block is not a mirror contact, and substituting one removes the safety function.
Ordering Pattern We See From Distributors
The common order is contactor frames plus aux blocks in a 1:1 or 1:2 ratio, sometimes with several frame sizes in one carton. That is normal for us. We produce a carton-level packing list that breaks out quantities by SKU so your receiving team puts the right parts on the right shelf.
Request a Quotation — Eaton DILM Auxiliary Contacts
Send the incumbent model and its ordering code. We reply with the matching frame, a written specification sheet, EXW price and lead time. MOQ 100 pcs per SKU.
Send Inquiry on WhatsAppEmail: Joanna@rfmando.com · MOQ 100 pcs per SKU · 1 free sample per SKU ($30 DHL, buyer pays) · Lead time 7-15 days · T/T 30/70 · EXW Xiamen
Compatibility and IP Position
Eaton and DILM are trademarks of Eaton Corporation plc. Our compatible contactors are independently engineered replacements using our own design and our own tooling, matched to the published frame size, current rating, terminal layout and coil options of the DILM family. We are not an authorised Eaton distributor, we do not apply Eaton branding to our goods, and no Eaton trademark or patent is reproduced on our product. Where a project specification requires an authorised-channel part, that part must come from Eaton.
Catalogue references for the specification above: RF Mando compatible XTMC9A01WD auxiliary contact block and LADN11C20 2NO+2NC auxiliary contact block. All are MOQ 100 pcs per SKU, 7-15 day lead time, one free sample per SKU, and supplied on our own PCBA and housing tooling with AQL 5% inspection available.
Where to Order
- Eaton DILM Contactors — DILM7 through DILM95 frames
- Eaton DILM Coils — 24V / 42V / 48V / 110V / 220V / 230V / 400V / 500V / 600V
- Eaton DILM Auxiliary Contacts — 1NO / 1NC add-on blocks
- Eaton DILM Contactor — complete catalogue and cross-reference
Terms
MOQ 100 pcs per SKU. One free sample per SKU ($30 DHL, buyer pays). Lead time 7-15 days. Payment T/T 30/70. Prices EXW Xiamen. 100% functional test on every unit; a third-party QC report at AQL 5% is available on request. CE-RED, RoHS and FCC Part 15 documentation; RCM available.