CHD-38-30021 Industrial Controls

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Time Delay Relays are a type of electrical controllers that are used to perform a wide variety of tasks where a precise and repeatable delay is required. The most common example is the timed operation of an appliance or equipment when a delay is needed in order to minimize energy use or provide safety. Common applications include automated lighting control, electrical motor protection, load shedding, and appliance motor start-up protection.

The CHD-38-30021 Time Delay Relay is a multi-function unit designed for applications where a micro-processor or digital control is not required, and a compact mounting is desired. The relay is designed with a single analog input and a variety of output types including; momentary and maintained contact, analog outputs, and negative triggering options. The CHD-38-30021 has two modes of operation, open-loop and closed-loop. The open-loop mode allows the user to program the relay to switch at a predetermined time without the need for any further adjustments. In the closed-loop mode, the unit will switch based on an input signal, either digital or analog.

The CHD-38-30021 also comes with a variety of timing ranges available, allowing the user to customize the system to their exact requirements. The minimum delay is adjustable by a trimmer or external potentiometer. All models come with transformers, for controlling larger loads, and a low-voltage/low-current auxiliary contact for external monitoring or control.

The common applications for the CHD-38-30021 Time Delay Relay can be grouped into four main categories:

• Industrial motor protection, for applications such as motors with automatic starts and stops, or delayed shut-off
• Lighting control, for usage in dimming applications or for lengthening the time a light stays on or off
• Load shedding, enabling devices such as furnaces or HVAC systems to shed power at peak rate times
• Appliance motor protection, so that operators have time to react after a motor fails

The CHD-38-30021 is an ideal choice to meet the needs of a wide range of industrial, commercial, and residential applications. The versatile, compact design means it can be used in virtually any application and the robust construction means it has a high degree of reliability. The digital programming and numerous output options make it a great choice for applications that require precise and repeatable timing.

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