Bloc de verrouillage mécanique Schneider LAD6K10F

Nom du produit: TeSys D / Deca Mechanical Latch Block

Fonction: After the contactor closes, it stays closed by mechanical locking; the coil does not need continuous power supply (économie d'énergie). Trip is triggered by pulse signal to terminals E1/E2; manual reset is also available.

1. Définition du modèle

LAD6K10: Mechanical latch main body

F = Control voltage: 110～127 V AC/DC (50/60 Hz)

2. Contacteurs compatibles

LC1D09～D80A, LC1DT20～DT80A, CAD control relays

⚠️ Not compatible with low-consumption coil contactors

3. Paramètres électriques clés

Control voltage Uc: 110–127 V AC / CC

Pulse duration requirement: AC ≥ 100 MS; DC ≥ 250 MS; Max pulse duration ≤ 10 s

AC power consumption: 25 Virginie; DC power consumption: 30 W

Fréquence de fonctionnement maximale: 1200 cycles/heure

Durée de vie mécanique: 500,000 cycles

Tension assignée d'isolement Ui: 690 V

Classe de protection: IP2X

Température de fonctionnement: -25℃ ~ +55℃

Montage: Front snap-on installation; screw terminals E1, E2

Trip modes: Electric pulse trip + réarmement manuel par bouton-poussoir

4. Principe de fonctionnement
5. Pulse power to contactor A1/A2 → Main contacts close; LAD6K10F mechanically latches and holds the closed state. The contactor remains closed even after the coil power is cut off.
6. To open the contactor: Send a 110~127 V pulse to terminals E1-E2 of the latch block → Mechanical unlock, contactor drops out. Manual reset via the front button is also supported.
7. Full Voltage Variant List (LAD6K10)

LAD6K10B: 24 V CA/CC

LAD6K10F: 110–127 V AC/DC (ce modèle)

LAD6K10M: 220–240 V AC/DC

LAD6K10Q: 380–415 V AC/DC

LAD6K10L: 200–208 V AC/DC (abandonné)

LAD6K10U: 256–277 V AC/DC (abandonné)

6. Applications typiques

Long-term closed loads, systèmes de stockage d'énergie, pompes à eau, gate valves, and circuits requiring coil power cut-off after closing to reduce heating and power consumption.

Câblage & PLC Timing Scheme for LAD6K10F (LC1D, 110~127V AC/DC trip)

Two independent pulse signals; never energize both at the same time. A1/A2 = closing pulse; E1/E2 = trip pulse; pulse duration shall not exceed 10 s.

Définition du terminal

Contacteur: A1, A2 → Closing coil (pulse only; keeps closed after mechanical latch without continuous power)

LAD6K10F: E1, E2 → Trip coil (110–127 V AC/DC for this model)

DIP switch on module: 0 = manual unlock; non-zero = enable mechanical latch (keep on non-zero for normal operation)

Câblage du circuit de commande (PLC version)

Alimentation de contrôle: 110~127 V (match LAD6K10F voltage)

1. PLC output Q0: Drive closing pulse → Contactor A1/A2 (use intermediate relay to protect PLC output)
2. PLC output Q1: Drive trip pulse → Terminals E1/E2 of LAD6K10F
3. Contactor NO auxiliary contact → PLC input I0 (retour d'état)
4. Verrouillage: Software interlock between Q0 and Q1; simultaneous output is strictly forbidden.

Simplified wiring description:

L (110V) → KA0 coil → Q0 → N; KA0 main contacts connect to A1/A2

L (110V) → KA1 coil → Q1 → N; KA1 main contacts connect to E1/E2

Contactor NO contact: One side to L, the other to PLC input I0

Recommend intermediate relays; do not drive the coil directly with PLC points, as the DC coil has high inrush current (30 Puissance W).

Timing Requirements (Obligatoire)

AC pulse ≥ 100 MS

DC pulse ≥ 250 MS

Upper pulse limit: ≤ 10 s (coil burnout if exceeded)

Séquence de synchronisation

1. Standby: Contactor open, I0=OFF
2. Closing command (I1 start): Q0 outputs 200 ms pulse → A1/A2 energized → Contactor closes and latches mechanically. Q0 cuts off after pulse ends; contactor stays closed, I0=ON.
3. Holding stage: No output on Q0/Q1, zero power consumption.
4. Trip command (I2 stop): Q1 outputs 300 ms pulse → E1/E2 energized for unlock → Contactor opens, I0=OFF; Q1 cuts off after pulse ends.

Logique API (Universal for Siemens / Mitsubishi)

Logic rules:

✅ Closing: Rising edge triggers TON timer for fixed pulse output

✅ Tripping: Rising edge triggers another TON timer for fixed pulse output

✅ Interlock: Block trip pulse while closing pulse is active, et vice versa

✅ Fault detection: If I0 remains OFF 500 ms after closing pulse, trigger alarm.

Sample logic (S7-1200 style):

I1: Start button

I2: Stop button

I0: Contactor auxiliary contact feedback

Q0: Closing pulse

T1: Trip pulse

T37: Closing pulse timer, PT=200 ms

T38: Trip pulse timer, PT=300 ms

1. Rising edge of I1 → Start T37; T37.Q = Q0; T37 auto-resets upon timeout.
2. Rising edge of I2 → Start T38; T38.Q = Q1; T38 auto-resets upon timeout.
3. Normally closed T37.Q in T38 startup circuit; normally closed T38.Q in T37 startup circuit (software interlock).
4. Alarme de défaut: If I0=0 after 500 ms of closing pulse, activate alarm.

Dépannage & Erreurs courantes

1. DIP switch set to 0: Latch function disabled; contactor opens immediately once A1/A2 power is lost.
2. Simultaneous closing & tripping output: Mechanical jamming or coil burnout.
3. Pulse too short: CA < 100 ms → latch/trip failure; CC < 250 ms → high failure rate.
4. Continuous pulse (no timer): Coil burns out after exceeding 10 s.
5. Low-consumption coil contactor: Incompatible with LAD6K10; latching will not work.

Fonctionnement manuel

Switch the DIP switch to 0 to release mechanically without power; used for commissioning and maintenance.

Emergency Stop Extension

Wire E-Stop NC contact in series with the E1/E2 trip circuit. Pressing E-Stop directly sends a trip pulse to open the load immediately.

1. Full Model List of Schneider TeSys D Mechanical Latch Blocks (Pulse Latch: LAD6K / LA6DK)

Two series:

LAD6K10 (petit cadre: LC1D09~D80A)

LA6DK20 (large frame: LC1D80~D150)

Suffix letter = trip coil voltage; AC/DC universal pulse trip; terminals E1/E2; front snap-on mounting with manual reset DIP switch.

LAD6K10 (For LC1D09~D80A, LC1DT20~DT80A, CAD relays; Low-consumption coils NOT supported)

LA6DK20 (For LC1D80~D150, LC1DT115~DT200 high-current contactors)

Unified Technical Specs

Pulse requirement: AC ≥ 100 MS, DC ≥ 250 MS; Max pulse duration ≤ 10 s

Durée de vie mécanique: 500,000 cycles

Fréquence de fonctionnement maximale: 1200 cycles/heure

Protection: IP2X

⚠️ Distinction importante: LAD9R1 / LAD9R3 are mechanical interlock blocks for two contactors (forward/reverse interlock), NOT pulse hold latches; completely different function, do not select incorrectly.

2. Comparaison équivalente entre marques

Key note: LAD6K is an external snap-on electromagnetic mechanical pulse latch exclusive to Schneider TeSys D.

Siemens, ABB, Mitsubishi do NOT manufacture identical front-mounted external latch modules with the same wiring logic.

Two replacement solutions:

1. Function-equivalent solution: Bi-stable contactors with built-in mechanical latch or independent pulse latch units (same control logic: pulse close, pulse trip).
2. Drop-in aftermarket replacement: Domestic compatible LAD6K modules (direct snap-on fit for LC1D; same terminals E1/E2, same wiring & timing).

❌ Warning: ABB VM, Siemens 3RA19xx, Mitsubishi UN-MLxx are ONLY mechanical interlock pieces for two contactors (forward/reverse interlock), with NO power-hold function; they cannot replace LAD6K.

Equivalent Replacement Table (Pulse Close + Mechanical Hold + Pulse Trip)

Non-Equivalent Models (Only Interlock, No Holding Function — Avoid These)

Replacement Selection Advice

1. If LC1D contactors remain in use: Choose domestic compatible LAD6K10; no changes to drawings or PLC program.
2. If contactor replacement is allowed: Select RT-series bi-stable contactors with integrated latch; fewer spare parts and lower failure rate.
3. Never use simple interlock pieces to replace LAD6K; control logic differs completely, and the contactor will drop out once coil power is removed.
4. Full Compatibility List (Latch Block vs Contactors)

Règle: Low-consumption coil contactors are NOT compatible with all LAD6K / LA6DK latches.

Same model body fits the same contactor range regardless of voltage suffix (B/F/M/Q).

1) LAD6K10 (LAD6K10F belongs to this group)

Compatible devices:

3-contacteurs de pôles: LC1D09, LC1D12, LC1D18, LC1D25, LC1D32, LC1D38, LC1D40A, LC1D50A, LC1D65A, LC1D80A

4-contacteurs de pôles (with neutral): LC1DT20, LC1DT25, LC1DT32, LC1DT40, LC1DT60A, LC1DT80A

Relais de contrôle: CAD32, CAD50 (standard coil only; low-consumption excluded)

2) LA6DK10 (Mid-size latch block)

Compatible devices:

3-pôle: LC1D40, LC1D50, LC1D65

4-pôle: LC1D65004, LC1D65008, LP1D65004, LP1D65008

3) LA6DK20 (Large-current latch block)

Compatible devices:

3-pôle: LC1D80, LC1D95, LC1D115, LC1D150 (CA & DC coil versions are both acceptable)

4-pôle: LP1D80004, LP1D80008, LC1D115004, LC1DT200A

Tableau récapitulatif

❌ Incompatible Product List (Pièges de sélection)

1. LC1D & CAD relays with low-consumption coils (latching mechanism cannot hold reliably)
2. TeSys K, TeSys E, iCT, iC65N contactors / relais
3. LC1F, LC1G, LC2D reversing contactors (different housing structure)
4. No-name clone LC1D contactors with modified mold

Notes complémentaires

Montage: All snap onto the front face without screws; only wire E1/E2 trip terminals.

Timing rule (universel): AC pulse ≥ 100 MS; DC pulse ≥ 250 MS; max pulse duration strictly ≤ 10 s.

Voltage suffix code (universel):

B=24V, F=110~127V, M=220~240V, Q=380~415V.