PLB171PTR

Series:	PLB, OptoMOS®
Packaging:	Tape & Reel (TR)
Part Status:	Active
Mounting Type:	Surface Mount
Circuit:	SPST-NC (1 Form B)
Output Type:	AC, DC
Voltage - Input:	1.2VDC
Voltage - Load:	0V ~ 800V
Load Current:	80mA
On-State Resistance (Max):	55 Ohms
Termination Style:	Gull Wing
Package / Case:	8-SMD (0.300", 7.62mm), 6 Leads
Supplier Device Package:	6-Flatpack

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Solid State Relays: PLB171PTR Application Field and Working Principle

Solid state relays (SSRs) are solid state electronic switching devices that control electrical power to a load using a low power control signal. They are highly reliable, require no EMI/RFI suppression, and offer fast switching times compared to wiring with mechanical relays. SSRs are ideal for a wide variety of industries that require instrumentation or system outputs for precise control, monitoring, or alerting.The PLB171PTR is a single-channel, zero-crossing type, 2-form-A SSR developed by Phoenix Contact. It is designed for use in DC circuit applications, such as controlling electrical motors, solenoids, contactors, or other DC loads. It is a pluggable, bayonet-style relay with built-in varistors that provide protection against electrical surges and transient spikes.The PLB171PTR Key features include:• Non-polarized, zero-crossing type AC/DC SSR• Operating voltage up to 370VAC/250VDC• Built-in varistors provide surge protection• Drain to source voltage of 60V• Low temperature coefficient (-80ppm/°C)• Rapid switching time (<8ms)• LED indicator for channel statusThe PLB171PTR is ideal for industrial processes and applications where precise and repeatable timing is important. It is widely used in agriculture/horticulture, oil/gas, and transportation systems for controlling temperature/humidity, on/off/multiple tasks, start/stop, hydraulic/pneumatic, and other electrical/mechanical tasks/processes.In terms of the working principle, the PLB171PTR uses the \'zero-crossing\' method to control the switching of the relay. This method uses the zero-crossing point of the input voltage waveform, rather than just the magnitude of the input voltage, to determine when to open or close the relay contact. This limits the inrush voltage and current during the switching process, thus preventing damage to the relay or connected loads.The control signal for the PLB171PTR is connected to the control circuit, and is designed to be powered by an external source. When the control signal is in the "on" state, the control circuit energizes the integrated MOSFET, creating an electric field across the SSR\'s switching mechanism, thus allowing the switching of the load. When the control signal changes to the "off" state, the electric field dissipates, and the switching mechanism turns off, thus cutting power to the load.The PLB171PTR is capable of switching up to 8A of continuous load current and 16A of initial inrush current. It has an operating temperature range of -45 to +75°C and a response time of less than 8ms. All these features make the PLB171PTR the perfect choice for fast-switching DC circuit applications.In conclusion, the PLB171PTR is a zero-crossing type SSR that is well-suited for DC power control in a variety of industries. It offers a wide operating voltage range, built-in surge protection, rapid switching time, and low temperature coefficient. Its easy to use, feature-rich design makes it the perfect choice for industrial or commercial applications where precise and repeatable timing is required.

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