MCTC4850KLB

Series:	MCTC
Packaging:	Bulk
Part Status:	Obsolete
Mounting Type:	Chassis Mount
Circuit:	SPST-NO (1 Form A)
Output Type:	AC, Proportional Control
Voltage - Input:	8 ~ 32VDC
Voltage - Load:	48V ~ 530V
Load Current:	50A
Termination Style:	Screw Terminal
Package / Case:	Hockey Puck
Supplier Device Package:	--

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Introduction

Solid State Relays (SSRs) are widely used in the electrical and electronic industries. They are used to control the electrical current flow between two contacts by switching the current ON or OFF without moving any parts. The most common SSR’s are MCTC4850KLB. In this article, we will discuss its application field and working principle.

Application Field

The MCTC4850KLB solid state relay is designed for general-purpose applications, and is especially useful in applications that require low-level current switching. It is commonly used in motor control, such as controlling the starting or stopping of motors, as well as switching pumps, valves and other equipment. It is also used in heating, lighting and air-conditioning control, where switching can be done more quickly and accurately than with an electromechanical relay.

Working Principle

The MCTC4850KLB is a voltage-operate, solid-state relay (SSR) that switches up to 48V AC/DC current without moving parts. It consists of a thyristor (SCR) as the output element and an electronic circuit as the control circuit. When the control circuit is activated, the SCR is triggered and the circuit is switched ON. When the control circuit is deactivated, the circuit is switched OFF. The SCR is driven by two separate input signals. First, the control circuit voltage is applied to the gate, or control electrode, of the SCR. This causes the SCR to reduce its resistance, allowing the AC voltage to pass through the device. Second, a zero-voltage alternating current (AC) is applied to the SCR’s anode and cathode. This causes the SCR to switch ON and OFF depending on the polarity of the AC voltage.The control circuit of the MCTC4850KLB is designed to provide maximum safety and reliability. The SCR is protected against over-voltage and over-current conditions and has a high dielectric strength of 2500 VAC. The control circuit also has a dual-redundant signal processing, which allows it to monitor the status of both the input voltage and the AC current, and to cut off the current or voltage when the limits are exceeded.

Conclusion

The MCTC4850KLB solid state relay is a reliable and safe device that is widely used in motor control, heating, lighting and air-conditioning control applications. It is capable of switching up to 48V AC/DC current without moving parts. The control circuit is designed to provide maximum safety and reliability, with a dual-redundant signal processing and a high dielectric strength.

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