Taihua Three phase overload current protection motor protector AS-21B

The new type AS-21B Three phase overload motor protector with current protection is an innovative product from Taihua that has been specifically designed to provide reliable and effective protection for three-phase motors. This protector is an electronic type that features a trip level of 30 and comes with a range of advanced features that make it highly flexible and customizable.One of the most significant advantages of this protector is its main circuit that adopts the core-through current sampling method, combined with advanced electronic (integrated circuit) circuits. This combination makes it highly effective in detecting and responding to overcurrent conditions, which could result in damage to your motor. The device also features sensitive phase failure protection, which helps to prevent damage to the motor phase caused by voltage fluctuations.Another key feature of the AS-21B three-phase overload protector is its strong anti-interference ability, which enables it to operate reliably in harsh industrial environments. The device has also been designed to be highly flexible and customizable, with continuously adjustable current value and overload delay settings.In addition to these features, the AS-21B protector has excellent inverse time characteristics, which enable it to respond quickly to different levels of overcurrent to minimize motor damage. The device is also highly efficient, reducing energy consumption and operating costs over the long term.Overall, the new type AS-21B Three phase overload motor protector with current protection is an innovative and highly effective protective device that offers a range of advanced features for three-phase motor protection. Its reliable operation, strong anti-interference ability, and adjustable settings make it an ideal choice for a wide range of industrial applications, including manufacturing, logistics, and transportation.

Main technical parameter

(1) Company code (2) Motor protector (3) Current sampling type (active type) (4) Design serial number (specification code) (5) B: Overload alarm (buzzer) N: With work/test transfer switch

Application

Working power	AC380V、AC220V 50Hz；The allowable voltage fluctuation range is (85%-110%) Ue
Adjustment method	Online current adjustment by potentiometer
Output control contact	AS-21：a group of NC contactAS-22：Change over contact 1Z
Reset mode	Power off reset
Contact capacity	AC-12,Ue:AC380V, Ie:3A
Mechanical life	1×10⁵ time
Electrical life	1×10⁴ time
Installation	AS-21：Device type/din railtypeAS-22：Device type

Rated working current
Model	Setting current range (A)	Suitable motor power (kW)	Minimum sampling current (A)
AS-21□(JD-5□)	0.5～5	0.25～2.5	≥3
AS-21□(JD-5□)	3～30	2～15
AS-21□(JD-5□)	1～100	0.5～50
AS-21□(JD-5□)	20～100	10～50
AS-22□(JD-6□)	63～400	30～200	10

Comparison Table of wire core threading
Motor Power(kW)	Corresponding setting current(A)	Core-threading turns (turns)
0.25～0.5	0.5～1	12～6
0.5～1	1～2	6～3
1～3	2～6	3～1
≥3	≥6	1

Overload Action Time Characteristics
Trip level	Different current multiples and action time PT
Trip level	1.05Ie	1.2Ie	1.5Ie	7.2Ie
2	Tp：no action within 2 hours	Tp：action within 2 hours	Tp≤1min	Tp≤4s
5			Tp≤2min	0.5s<Tp≤5s
10(A)			Tp≤4min	2s<Tp≤10s
15			Tp≤6min	4s<Tp≤15s
20			Tp≤8min	6s<Tp≤20s
25			Tp≤10min	8s<Tp≤25s
30			Tp≤12min	9s<Tp≤30s

Anti-time characteristic diagram of overload protection

Model Number Structure

Features

●Conform to GB/T14048.4 and many other national or industry standards.

●Three-phase electronic type, the trip level is 30.

●Possess current phase failure and overload protection functions, sensitive phase failure protection, reliable operation, and anti-interference ability Strong, set current value and overload delay are continuously adjustable; and have good inverse time characteristics and other advantages point.

●The main circuit adopts the core-through current sampling method, combined with advanced electronic (integrated circuit) circuits.

●Installation method: socket type, Din-rail type installation.

Application circuit example