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This is a Schneider TeSys K series 3-pole miniature AC contactor. It has a rated operational current of 12A (AC-3, 440V), coil voltage of 110V AC, and is fitted with 1 Normally Open (1NO) auxiliary contact. It adopts screw-clamp terminals. Designed for motor control, HVAC systems and small industrial equipment. Some legacy variants are discontinued, while this exact model remains in production. For performance upgrade, you may switch to the TeSys D series.
- Model Code Explanation
| Code Segment | Definition | Detailed Description |
| LC1 | Product Category | Prefix for Schneider AC contactors; LC stands for contactor, 1 for standard type |
| K | Product Series | TeSys K series, miniature compact contactors for low-power control |
| 12 | Rated Operational Current | 12A (AC-3, 440V), suitable for motors up to 5.5kW @ 400V |
| 10 | Auxiliary Contact Configuration | 1NO (1 Normally Open), 0NC (0 Normally Closed) |
| F | Coil Voltage Code | 110V AC coil (50/60Hz universal) |
| 7 | Wiring Type | Screw-clamp terminals, standard mounting |
- Main Technical Specifications
| Category | Technical Data | Remarks |
| Basic Characteristics | ||
| Product Type | 3-pole AC Contactor | For switching 3-phase circuits |
| Series | TeSys K | Schneider miniature contactor range |
| Poles | 3P (L1, L2, L3) | 3-phase control |
| Rated Operational Current (In) | 12A (AC-3, 440V) | Controls motors up to 5.5kW @ 400V |
| Rated Operational Voltage (Ue) | 690V AC | Maximum working voltage |
| Control Coil Voltage (Uc) | 110V AC (50/60Hz) | Universal frequency design |
| Auxiliary Contact | 1NO (Normally Open) | For circuit latching or signal feedback |
| Performance Parameters | ||
| Rated Operating Frequency | 1200 cycles/hour (AC-3) | Standard duty for motor control |
| Mechanical Endurance | 10,000,000 operations | No-load cycles |
| Electrical Endurance | 1,000,000 operations (AC-3, rated current) | On-load cycles |
| Coil Power Consumption | Pick-up: 7VA, Holding: 2VA | Low power consumption, energy-saving |
| Pick-up Time | ≤ 60ms | Fast response |
| Drop-out Time | ≤ 40ms | Fast disconnection |
| Physical Characteristics | ||
| Dimensions (W × H × D) | 45mm × 85mm × 57mm | Standard modular design, occupies 3 module units |
| Mounting | 35mm DIN rail / Panel mounting | Compliant with EN 50022 |
| Terminals | Screw clamp, max wire cross-section: 2.5mm² | Easy installation with reliable connection |
| Weight | Approx. 180g | Weight per unit |
| Environment & Certifications | ||
| Operating Temperature | -25°C ~ +55°C | Performance may degrade beyond this range |
| Storage Temperature | -40°C ~ +85°C | |
| Humidity | 5% ~ 95% (Non-condensing) | |
| Ingress Protection | IP20 | Finger-proof, not for outdoor use |
| Certifications | IEC 60947-4-1, EN 60947-4-1 | CE marked, complies with international safety standards |
| Lifecycle Status | ||
| Status | Some old models updated; LC1K1210F7 is still in production | Obsolete legacy versions phased out; this model remains available |
- Full Model List (TeSys K Series 12A)
| Model | Coil Voltage | Auxiliary Contact | Wiring Type | Order Reference | Application |
| LC1K1210F7 | 110V AC | 1NO | Screw | LC1K1210F7 | General industrial control, North American & Asian equipment |
| LC1K1210E7 | 48V AC | 1NO | Screw | LC1K1210E7 | Safety control circuits, low-voltage systems |
| LC1K1210G7 | 120V AC | 1NO | Screw | LC1K1210G7 | North American standard equipment |
| LC1K1210M7 | 220V AC | 1NO | Screw | LC1K1210M7 | European & Asian standard equipment |
| LC1K1210Q7 | 24V DC | 1NO | Screw | LC1K1210Q7 | DC control circuits, PLC systems |
| LC1K1201F7 | 110V AC | 1NC | Screw | LC1K1201F7 | Circuits requiring Normally Closed feedback |
| LC1K1210U7 | 240V AC | 1NO | Screw | LC1K1210U7 | Heavy-duty industrial equipment |
| LC1K1210V7 | 400V AC | 1NO | Screw | LC1K1210V7 | High-voltage control circuits |
- Replacement & Cross-Brand Equivalents
4.1 Original Manufacturer Replacements
| Original Model | Replacement Model | Reason | Compatibility |
| LC1K1210F7 | LC1K1210F7 | Same model continuously produced | Fully compatible, direct replacement |
| LC1D1210F7 | Upgrade to TeSys D series with enhanced performance | Dimensionally compatible, improved functions | |
| LC1E1210F7 | Economy version for cost optimization | Similar performance, lower cost |
4.2 Cross-Brand Compatible Products
| Brand | Model | Matching Level | Remarks |
| ABB | A12-30-10*110V | 95% | Same dimensions and performance |
| Siemens | 3RT2015-1BB41 | 90% | Identical auxiliary contact configuration |
| Legrand | 8860 | 90% | Different terminal design |
| Chint (China) | CJX2-1210*110V | 85% | Cost-effective with complete certifications |
- Application & Typical Cases
5.1 Recommended Applications
Motor Control: Direct start/stop for 3-phase asynchronous motors below 5.5kW
HVAC Systems: Control of air conditioning compressors, fans and water pumps, small central air-conditioning units
Industrial Automation: PLC control circuits, conveyors, packaging machinery and other small equipment
Commercial Buildings: Elevator door operators, fire safety equipment and lighting control
Agricultural Equipment: Irrigation pumps and greenhouse ventilation systems
5.2 Non-Recommended Applications
High-frequency cycling: Operating frequency over 1200 cycles/hour. TeSys D series is recommended.
High-power motors: Motors exceeding 5.5kW @ 400V. Select higher-rated contactors.
Outdoor humid environments: IP20 protection is insufficient; additional enclosure protection required.
Explosive hazardous areas: Explosion-proof contactors must be used.
5.3 Typical Application Cases
Case 1: Small Injection Molding Machine
Equipment: 3kW hydraulic pump motor for injection molding machine
Issue: Original contactor was bulky and limited cabinet space
Solution: Install LC1K1210F7 together with overload relay
Result: 50% space saving, simpler control circuit and lower failure rate
Case 2: Hospital Central Air-Conditioning System
Equipment: 4kW fan motors in parallel operation
Requirements: Low noise, low power consumption and high reliability
Solution: Adopt LC1K1210F7 with Schneider EOCR overload protection
Result: 15% energy saving, stable operation and reduced maintenance cost
- Troubleshooting & Maintenance Guide
6.1 Common Faults & Solutions
| Fault Phenomenon | Possible Causes | Remedial Actions |
| Coil fails to pull in | 1. No voltage or incorrect coil voltage | 1. Verify power voltage matches coil rating |
| 2. Burned coil | 2. Measure coil resistance; replace if open-circuited | |
| 3. Open control circuit | 3. Check wiring and components in control circuit | |
| 4. Mechanical jamming | 4. Clean iron core, inspect springs and sliding parts | |
| Loud noise after pull-in | 1. Broken shading coil | 1. Replace core assembly |
| 2. Dust/rust on core surface | 2. Clean core contact surface | |
| 3. Uneven mounting | 3. Reinstall and level the unit | |
| 4. Undervoltage supply | 4. Ensure supply voltage within 卤10% tolerance | |
| Main contacts burned | 1. Overload current | 1. Replace with higher-rated contactor |
| 2. Frequent cycling | 2. Optimize control logic to reduce switching frequency | |
| 3. Poor arc suppression | 3. Install surge suppressor | |
| 4. Fatigued contact springs | 4. Replace contact assembly | |
| Auxiliary contact malfunction | 1. Burned contacts | 1. Replace auxiliary contact module |
| 2. Loose wiring | 2. Retighten terminal screws | |
| 3. Linkage mechanism fault | 3. Inspect linkage; replace if necessary |
6.2 Maintenance Procedures
- Monthly Routine Inspection
Check appearance for damage or discoloration
Inspect terminals for looseness and overheating signs
Test pull-in and drop-out action for smooth operation and abnormal noise
- Annual Preventive Maintenance
Power off and clean surface with dry soft cloth
Inspect contact wear; replace if wear depth exceeds 1mm
Measure coil resistance to confirm normal status
Lubricate moving parts with small amount of silicone-based grease
- Replacement Cycle
Standard operating conditions: 5 ~ 8 years
High-frequency cycling: 2 ~ 3 years
Harsh environment (high temperature / high humidity): 1 ~ 2 years
6.3 Quick Troubleshooting Tips
For LC1K miniature contactors rated 12A for motor control
Check voltage first if coil fails to energize; check core for abnormal noise
Replace unit when contacts burn or auxiliary contacts fail
Regular inspection ensures safety; replace after 5 years service life
- Selection Guidelines
- Current Rating: Select current ≥ 1.2 times motor rated current. 12A is suitable for motors below 5.5kW.
- Coil Voltage: Match coil voltage with control circuit voltage. Common ratings: 24V DC, 110V AC, 220V AC.
- Auxiliary Contacts: 1NO for latching; 1NC for interlock; 1NO+1NC for complex control.
- Wiring Type: Screw terminals for fixed installation; spring terminals for frequent rewiring.
- Replacement Rule: Prioritize same-series products; verify dimensions and mounting when switching to other series.
