Eaton DILM820-XHI11-SI Side-Mounted Auxiliary Contact Module

Order No.: 208281, Alias: XTCEXSBR11

Positioning: Side-mounted auxiliary contact module for high-power DILM/DILH series contactors (Moeller series)

✅ Model Code Explanation

DILM820-X: Accessory for high-frame DILM power contactors

HI11: 1NO + 1NC (1 make, 1 break)

SI: Side Install (side mounting; differentiated from SA & V variants)

✅ Key Contact Characteristics (Critical)

Interlocked Mirror Contact, compliant with IEC 60947-5-1 Annex L and IEC 60947-4-1 Annex F

The NC contact is a mirror contact, designed for safety circuits, interlocking, emergency stop feedback and PLC safety signal acquisition. It is NOT a late-break NC contact

Contact configuration: 1 Normally Open + 1 Normally Closed

Termination: M3.5 screw terminals, tightening torque: 1.2 Nm

Conventional thermal current Ith: 10 A (at 60 °C)

AC-15 control capacity:

230 V: 6 A

400 V: 4 A

500 V: 1.5 A

Rated insulation voltage Ui: 690 V; Uimp: 6 kV; Overvoltage Category III, Pollution Degree 3

Electrical isolation: Coil-to-auxiliary contacts and auxiliary-to-main contacts meet AC 440V isolation level

✅ Compatible Base Contactors (Only for this high-power frame)

DILM250 ~ DILM1000, DILH600 ~ DILH2600, DILDC300 ~ DILDC600 DC contactors

Max. 1 module on each side (left & right), maximum 2 modules per contactor

✅ Dimensions & Weight

W15 mm × H77 mm × D77 mm, Net weight: 37 g

✅ Cross-Series Comparison (Selection Guide)

DILM820-XHI11-SI: Side mount, screw terminals, interlocked mirror contact (standard model, this part)

DILM820-XHI11V-SI: Side mount, vibration-resistant reinforced version

DILM820-XHI11-SA: Standard interlocked contact (non-mirror), not for safety EDM monitoring

✅ Certifications

CE, UL, CSA, CCC; compliant with railway standard EN 45545 and vibration standard IEC 61373. Suitable for cranes, air compressors, fans, high-power motor circuits, safety gate interlocks and inverter bypass feedback.

✅ Typical Applications

Safety interlock circuits, contactor status feedback to PLC, forward/reverse electrical interlocking, fault feedback, safety relay input signals.

This side-mounted IEC 60947-5-1 Annex L mirror contact module (1NO+1 mirror NC) is exclusively for DILM250~DILM1000 and DILH high-power contactors. It is mainly used in safety-related control circuits, high-power motor control and fault diagnosis feedback, and cannot be replaced by standard auxiliary contacts for safety validation.

1. Safety Circuits (Most Common, Mandatory for Safety Audits)
2. EDM External Device Monitoring for Safety Relays

The mirror NC contact is wired into the EDM channel of the safety relay to monitor welding/sticking of the contactor main contacts. If the NC fails to reset after coil de-energization, the safety relay triggers a lockout. It meets ISO 13849 PLd/PLe and SIL2/3, which is the standard solution for Eaton ESR, Pilz and Schneider XPS safety circuits.

2. Safety Gate / Light Curtain Interlocking

The mirror NC verifies the true open state of the contactor after the safety gate is opened, preventing unexpected motor operation caused by welded main contacts.

3. Emergency Stop State Verification

After E-stop cuts off the contactor coil, the mirror contact confirms the contactor is physically open, eliminating hidden risks from welded main contacts despite valid E-stop signals.

1. High-Power Motor Control Circuits
2. Hardware Electrical Interlock for Forward/Reverse Contactors (Preferred for Large Fans, Pumps and Hoists)

The mirror NC of each contactor is wired in series into the coil circuit of the opposing contactor, forming hardwired interlock to prevent simultaneous closure and phase-to-phase short circuit. For DILM high-power contactors, safety auditors will not approve ordinary auxiliary contacts for this interlock.

III. Performance Comparison Table

1. Limitations (Derived from Mechanical Design)
2. Only fits DILM250~DILM1000 / DILH high-power contactors; smaller frames do not match the mechanical stroke.
3. Designed exclusively for control signals: Ith=10 A, AC-15 230V=6A; cannot carry main power loads.
4. The mirror NC only detects welded closed main contacts. It cannot detect poor contact or increased contact resistance.

Full Model List for DILM820-XHI Series

Only 3 mass-produced variants: all side-mounted 1NO+1NC positive-interlock contacts; differences are mirror (SI) / standard (SA) and vibration-resistant (V) versions.

1. Model Coding Rules

DILM820-XHI: Side auxiliary contact module for DILM/DILH high-power contactors (DILM250 ~ DILH2600)

11: 1NO + 1NC (1 make + 1 break)

S: Side mounted

SI: Mirror Contact (IEC 60947-4-1 Annex F, approved for EDM welding monitoring)

SA: Standard positive interlock contact (IEC 60947-5-1 Annex L only; NOT allowed for safety relay EDM)

V: Vibration-resistant reinforced construction (railway, heavy vibrating equipment)

2. Complete Product List

3. Key Selection Distinction

(1) SI vs SA (Most Critical)

SI: NC is a certified mirror contact. It stays open when main contacts are welded, satisfying ISO 13849 PLd / SIL2-3 and approved for safety relay EDM loops.

SA: Only mechanical positive interlock without welding test certification. Only for ordinary control; rejected by safety audits.

(2) V-SI Variant

Mechanically reinforced for higher shock & vibration resistance (IEC 61373). Electrical specs are identical to standard SI. Used for hoisting, mining and railway rolling stock.

4. Universal Installation Restrictions

Mounting: Only side-fit on DILM250~DILM1000 and all DILH series contactors.

Quantity: Max. 1 module per side, total maximum 2 modules per contactor.

Rating: Ith=10 A, AC-15 230V=6A; strictly for control circuits only, no power loads.

5. No Other Variants

No XHI22 (2NO+2NC) version available.

No top-mount version; only side-mount (S) models.

No spring-cage terminals; all models use M3.5 screw terminals.

6. Cross-Brand Equivalent

Eaton DILM820-XHI11-SI ↔ Siemens 3RT1956-4G (mirror contact); Schneider LADN13C is only standard auxiliary contact and cannot replace the mirror type for safety EDM.