GT01-C300R4-8P MITSUBISHI

GT01-C300R4-8P MITSUBISHI Relay Input Module

Product  Description：

Mitsubishi Electric Relay Input Modules are specialized interface components designed for Programmable Logic Controller (PLC) systems, such as the MELSEC series. Unlike standard transistor input modules that use solid-state switching, these modules utilize physical mechanical relays to detect incoming signals. They are primarily used in environments where galvanic isolation and high-voltage signal detection are required, or where the input signal comes from a source that is incompatible with typical DC electronic logic.

Product Parameters

The technical specifications for these modules focus on electrical isolation and compatibility with various signal levels:

• Input Points: Typically available in configurations of 8 or 16 points per module.

• Rated Input Voltage: Capable of accepting both AC and DC signals, commonly supporting 24V DC, 100V-120V AC, and 200V-240V AC.

• Minimum Switching Load: Designed to operate reliably with low-current signals, often specified at 1mA or 5mA at 5V DC.

• Insulation Method: Mechanical relay isolation provides a physical air gap between the external field circuit and the internal PLC bus.

• Response Time: Due to the mechanical nature of the internal relays, response times are generally slower than transistor modules, typically ranging from 10ms to 20ms for both ON and OFF operations.

• Contact Life: Rated for millions of mechanical operations, though electrical life depends on the characteristics of the signal being detected.

Product Advantages

Relay Input Modules offer unique benefits that make them indispensable for specific industrial architectures:

• Universal Signal Compatibility: Because they use mechanical contacts, these modules can often sense a wide variety of signal types, whether they are AC or DC, without needing separate specialized modules.

• High Noise Immunity: The physical separation and mechanical action of a relay make these modules extremely resistant to electromagnetic interference (EMI) and transient voltage spikes that might trigger a solid-state sensor incorrectly.

• Superior Isolation: They provide a high level of dielectric strength between the field devices and the PLC CPU, offering an extra layer of protection for the expensive central processing components.

• Visual Diagnostic Status: Each input point is equipped with a dedicated LED indicator that lights up when the relay is energized, making it easy for maintenance staff to verify signal presence.

• Reliability in High-Voltage Detection: They are ideal for monitoring the status of large motors or power circuits where the signal voltage is standard mains power (110V/220V).

Product Applications

These modules are frequently found in heavy industrial and infrastructure applications:

• Power Distribution Monitoring: Detecting the status of circuit breakers, disconnect switches, and protective relays in electrical substations.

• Legacy System Integration: Interfacing newer Mitsubishi PLCs with older control systems that utilize high-voltage AC control logic.

• Safety Interlocking: Monitoring the status of large safety contactors or limit switches in heavy-duty machinery where high-voltage signals are standard.

• Remote Signal Acquisition: Sensing signals from long cable runs where induced voltage or noise might cause false triggers on sensitive transistor-based input modules.

• Facility Management: Monitoring HVAC dampers, fire alarm contacts, and security sensors across large commercial buildings.

Important Precautions

To ensure the longevity of the relay contacts and the safety of the system, users should follow these guidelines:

• Mechanical Wear Limits: Users must track the number of operations. Unlike transistor inputs, relay inputs have a finite lifespan. Avoid using relay modules for high-frequency switching tasks.

• Inrush Current Management: Ensure that the devices connected to the input do not exceed the rated current of the relay contacts, especially when dealing with capacitive or inductive loads that can cause arcing.

• Minimum Load Requirement: If the input signal is extremely low voltage or low current, the contact resistance of the relay may cause intermittent signals. Ensure the signal meets the module’s minimum switching load specification.

• Mounting Orientation: Always install the module in the orientation recommended by Mitsubishi to prevent mechanical fatigue of the relay armatures due to gravity or vibration.

• Prevention of Contact Welding: Never apply a voltage significantly higher than the rated specification, as this can cause the internal relay contacts to weld together in a permanently "ON" state.

The structure and details of the product：

Our services：

Shipping Port:  China

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Warranty: one year

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