Description
LM10 GE Logic Master/Auxiliary Contact
Product Dimensions：
Product Description (Detailed Explanation)
The LM10 is designed to expand the signaling capabilities of primary power switching devices (such as contactors or circuit breakers). Its main role is to provide feedback to a control system (PLC) or to interlock with other hardware components.
In many configurations, the LM10 is a top-mounted or side-mounted auxiliary contact block that physically attaches to the main moving carrier of a GE contactor. When the main contacts close or open, the LM10’s internal micro-switches change state, allowing for the coordination of complex control sequences, such as “Star-Delta” motor starting or status indication on a control panel.
Product Parameters (Technical Specifications)
| Parameter Category | Specification |
| Component Type | Auxiliary Contact Block / Logic Master |
| Contact Configuration | 1 NO (Normally Open) + 1 NC (Normally Closed) Standard |
| Rated Insulation Voltage ($U_i$) | 690 V |
| Thermal Current ($I_{th}$) | 10 A |
| Minimum Switching Capacity | 5 mA at 17V DC (Logic Level compatible) |
| Mounting Style | Snap-on (Front or Side depending on Base Unit) |
| Mechanical Life | > 10 million switching cycles |
| Terminal Type | Screw Clamp Terminals |
| Weight | Approx. 0.05 kg |
Product Advantages (Key Benefits)
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High Reliability: Features self-cleaning “wipe-action” contacts that prevent the buildup of oxidation, ensuring consistent electrical continuity even in dusty environments.
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Logic Level Compatibility: Specifically engineered to handle the low-current signals required by modern PLCs and electronic controllers, reducing the risk of “dry contact” signal loss.
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Tool-Free Installation: The snap-on design allows for rapid field upgrades or replacements without the need for specialized mounting hardware.
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Space-Saving Design: Its compact footprint ensures that adding auxiliary functions does not significantly increase the overall dimensions of the motor starter assembly.
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Clear Identification: Features high-contrast terminal markings (e.g., 13/14 for NO, 21/22 for NC) to simplify wiring and reduce human error during maintenance.
Precautions (Important Notes)
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Compatibility Check: Ensure the LM10 is used with the correct series of GE contactors (e.g., C-2000 series or legacy CL/CK series). Using it with incompatible frames may lead to mechanical binding.
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Voltage Limitations: While the thermal current is rated for 10A, the switching capacity for high-inductive AC loads (AC-15) is lower. Refer to the specific load curves for inductive motor control.
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Environmental Sealing: The LM10 is typically rated for IP20. If used in high-moisture or corrosive environments, it must be housed within a NEMA 4 or IP65-rated enclosure.
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Wiring Torque: Do not over-tighten the screw terminals; follow the manufacturer’s recommended torque (usually 0.8 – 1.2 Nm) to avoid stripping the threads or damaging the internal plastic housing.
Product Applications (Typical Use Cases)
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Motor Status Feedback: Sending an “On/Off” status signal to a remote SCADA system or PLC input module.
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Electrical Interlocking: Preventing two contactors (such as Forward and Reverse) from being energized simultaneously to avoid short circuits.
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Fault Signaling: Wiring a series of auxiliary contacts to a master alarm relay to indicate a trip or failure in a specific motor branch.
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Control Circuit Logic: Used in traditional hard-wired logic circuits for automated sequence control in conveyors, pumps, and fans.
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Pilot Light Activation: Directly switching local indicator lamps on a control cabinet door to show the operational state of machinery.
Shipping Port: Xiamen, China
Payment: Bank of Chicago, Bank of Singapore
Express cooperation: fedex, DHL, UPS and your express account
Service: Professional Sales provides 24 hours /7 days online service
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