THDB421A工业自动化与控制的延时继电器规格书PDF中文资料

THDB421A属于工业自动化与控制的延时继电器。由力特公司制造生产的THDB421A延时继电器延时继电器是使用较小控制信号启动或停止大负载的机电器件。这些器件内置有时间延迟来控制继电器的触发。功能包括间隔、关闭延迟、打开延迟、单次、可编程（多功能）、重复周期、双定时器、信号开/关延迟和 Star/Delta 控制器。

描述 Description

The THDB Series combines accurate timing circuitry with high

power, solid-state switching. It can switch motors, lamps, and

heaters directly without a contactor. You can reduce labor,

component cost, and increase reliability with these small,

easy-to-use, timers.

Operation (Delay-on-Break)

Input voltage must be applied before and during timing. Upon

closure of the initiate switch, the output energizes. The time

delay begins when the initiate switch is opened. The output

remains energized during timing. At the end of the time delay,

the output de-energizes. The output energizes if the initiate

switch is closed when input voltage is applied.

Reset: Reclosing the initiate switch during timing resets the time

delay. Loss of input voltage resets the time delay and output.

FEATURES BENEFITS

Microcontroller based Repeat accuracy + / - 0.5,

Factory calibration + / - 1

High load currents up

to 20A, 200A inrush

Allows direct operation of motors, lamps and

heaters without a contactor

Totally solid state

and encapsulated

No moving parts to arc and wear out over time and

encapsulated to protect against shock, vibration,

and humidity

Metalized

mounting surface Facilitates heat transfer in high current applications

Compact, low

cost design

Allows flexibility for OEM applications and reduces

labor and components costs