H3M-AC120-B

Series:	H3M
Part Status:	Obsolete
Mounting Type:	Socketable
Relay Type:	Mechanical Relay
Function:	On-Delay
Circuit:	DPDT (2 Form C)
Delay Time:	0.1 Sec ~ 10 Min
Contact Rating @ Voltage:	5A @ 250VAC
Voltage - Supply:	120VAC
Termination Style:	Plug In, 8 Pin (Octal)
Timing Adjustment Method:	Hand Dial
Timing Initiate Method:	Input Voltage

Due to market price fluctuations, if you need to purchase or consult the price. You can contact us or emial to us:   sales@allicdata.com

Time Delay Relays: H3M-AC120-B application field and working principle

Time delay relays, sometimes referred to as Delay on Release (DoR) or Timed on Release (ToR) relays are a type of range timer which control the release of its output through a delay. This article focuses on one of the more popular time delay relays, the H3M-AC120-B, discussing its application field and working principle.

Application fields of H3M-AC120-B

The H3M-AC120-B time delay relay is a dependable time delay relay used in many industrial and consumer applications. The H3M-AC120-B features a delayed OFF (DoR) timing and is used in the following applications:

• Freeze protection: The H3M-AC120-B delay relay prevents water pipes from freezing by controlling the output that turns a heat source controller “on” and “off”.
• Lighting control: The H3M-AC120-B relay can control a lighting system, to reduce energy consumption.
• Security systems: The H3M-AC120-B can be used in security systems, to trigger alarms when an intruder is detected.
• Machines, motors, and pumps: The H3M-AC120-B can be used to control machines, motors, and pumps.

Working Principle of H3M-AC120-B

The H3M-AC120-B time delay relay is powered by an AC voltage and is designed to open the normally closed contacts when the AC voltage is present and the timer delay is completed. The relay interacts with an electromechanical solenoid, which produces a magnetic field, when the pilot voltage is applied, the electromagnetic field causes the relay contacts to “trip” and open the circuit.The time delay of the H3M-AC120-B is set when the coil winding is energized, using a variable resistor, called a timing capacitor (or resistor). The timing capacitor is charged when the relay is energized and the output is triggered when the capacitor reaches its set voltage level. This triggers the electromechanical solenoid, which causes the relay contacts to open or close, depending on the location of the contacts.The H3M-AC120-B also has a built-in adjustable current limit which helps protect the device’s delicate parts if the output is overloaded. This adjustable current limit is useful in applications where it is necessary to limit the output current once it reaches a certain level.

Conclusion

The H3M-AC120-B time delay relay has proven to be a dependable and versatile device, providing reliable performance in a wide variety of applications. The adjustable current limit and the variable timing capacitor provide the extra layer of protection necessary for complex industrial operations and consumer applications. The versatility and reliability of the H3M-AC120-B make it an ideal choice for a variety of time delay applications.

The specific data is subject to PDF, and the above content is for reference