MS1-32

Application:

• MS 1-32 type Motor Protection Circuit Breaker (MPCB) is applicable to AC electric circuit with frequency 50/60 Hz, rated voltage up to 690 V and rated current up to 32A. It protects against the overload, disconnection of phase and short-circuit of three-phase asynchronous motors, and it is suitable for unfrequently starting & breaking operations for the motor. It can also be used for electrical circuit protection, unfrequent load changeover and isolation. It provides the function of current rating adjustment to suit the motor.

Meaning and classification models

Normal operation and mounting requirement

• Altitude above sea level on more than 2000 m.
• Ambient temperature -5°C~ +40°C, average temperature not exceeding 35°C.
• Humidity not exceeding 50% at 40°C .Allowing higher humidity at lower temperature, e.g. the humidity should not exceeding 90% at 20°C. Special treatment should be taken for occasional coagulate dew due to temperature alteration.
• Ambient Pollution class 3.
• Installation sort: III.
• Product shall be installed vertically, titling angle no more than ±5°, at the place where there shall be no severe impact or vibration.
• Tripping level：10A
• Rated operation mode: uninterrupted operating.

Technical Data

1, Rated Isolating Voltege Ui：690 V；
2, Rated Operating voltage Ue：230/240V、400/415V、440V/460V、500V/525V、600V/690V；
3, Rated Frequency：50/60Hz
4, Frame Rating Inm：32A
5, Rated Impacting Voltage Uimp：6 KV；
6, Frame Rating Inm, Rated Frequency, Rated Current Ie, Rated Current Adjusting Range, and Rated Operating Voltage Ue are figured in Table 1.
7, Short-circuit Capacity: Under the circumstances of rated current 32A and rated voltage 400V, the rated limit short-circuit current is Icu =13.3KA, and rated operating short-circuit current is Ics=10KA

Table 1 Basic Parameter

Frame Rating Inm (A)	Rated Frequency (Hz)	Rated Current Ie (A)	Rated Current Adjusting Range (A)	Rated Operating Voltage Ue
32	50/60	1	0.63～1	230/240V 400/415V 440V/460V 500V 690V
		4	2.5～4
		6	4～6
		8	5～8
		10	6～10
		13	9～13
		17	11～17
		22	14～22
		26	18～26
		32	22～32

8. The Rated Power of three-phase motor controlled by the product (MPCB) is figured in Table 2

Table 2 Rated Power of Three-phase motor controlled by the product (MPCB)

Frame Rating Inm (A)	Rated Frequency (Hz)	Rated Current Ie (A)	Rated Current Adjusting Range A	Rated Power of Three-phase motor（KW）
				AC-3, 50Hz/60Hz
				230V	400V	690V
32	50/60	1	0.63～1	0.12	0.25	0.55
		4	2.5～4	0.75	1.5	3
		6	4～6	1.5	2.2	4
		8	5～8	1.5	3	5.5
		10	6～10	3	4	7.5
		13	9～13	3	5.5	11
		17	11～17	4	7.5	11
		22	14～22	4	7.5	15
		26	18～26	5.5	11	18.5
		32	22～32	7.5	15	22

9. Protection Class: IP 20
10.Operation Performance: Table 3

Table 3 Motor Starter operation characteristics

Rated Current A	Operation cycles per Hour(Min)	Operation cycles
		Without current	With current	Total
Ie≤100A	120	10000	2000	12000

11. Overload tripping characteristics: Table 4

Table 4 Overload tripping characteristics

Step	Multiple of setting current	Start State	Engaged time	Expecting result	Ambient temperature
1	1.05 Ie	Cold	t≥2h	No trip	+20°C±2°C
2	1.2 Ie	Heat (operating immediately after step 1)	t＜2h	Trip	+20°C±2°C
3	1.5 Ie	After heat stabilization at one time of setting current	t≤2min	Trip	+20°C±2°C
4	7.2 Ie	Cold	2s＜t≤10s	Trip

12. Tripping characteristics for unbalanced load in phases (disconnection of phases): Table 5

Table 5 Tripping characteristics for unbalanced load in phases (disconnection of phases):

Step	Multiple of setting current		Start State	Required time	Engaged result	Ambient temperature
	Random two phases	The third phase
1	1.0 Ie	0.9 Ie	Cold	≥2h	No trip	+20°C±2°C
2	1.15 Ie	0	Heat (operating immediately to reach the required current after step 1)	＜2h	Trip	+20°C±2°C

13. Temperature compensation characteristics: Table 6

Table 6 Temperature compensation characteristics

Step	Multiple of setting current	Motoring circumstance	Required time	Except result	Environment temperature
1	1.0 Ie	Cold	≥2h	Do not trip	+55°C±2°C
2	1.2 Ie	Heat (operating immediately to reach the required current after step 1)	＜2h	Trip	+55°C±2°C
3	1.05 Ie	Cold	≥2h	Do not trip	-5°C±2°C
4	1.3 Ie	Heat (operating immediately to reach the required current after step 3)	＜2h	Trip	-5°C±2°C

14. Setting value of the instantaneous tripping value and tripping characteristics: Table 7

Table 7 Instantaneous trip curve and tripping current

Instantaneous tripping curve	Level	Tripping current value Ir	Tripping time Tp, s
D	10A	Ir≥13 Ie	2＜Tp≤10

Able to trip at setting current (13 In) within tolerance ±10%.

15. Selection of complementary fuse When the expected short-circuit current at the installation place exceeds the MPCB’s rated limit short-circuit capacity, a complementary fuse shall be needed. The selection is according to Table 8

Table 8 Current ratings of the needed complementary fuse gG/gL while Icc＞Icu (A)

Rated current Ie (A)	1	4	6	8	10	13	17	22	26	32
Voltage level	current ratings of the needed complementary fuse gG/gL while Icc＞Icu (A)
230/240V	★	★	★	★	★	★	★	★	★	★
400/415V	★	★	★	★	★	★	100	125	125	125
440/460V	★	★	★	80	80	80	80	100	100	100
500V	★	★	★	63	80	80	80	80	80	80
690V	★	40	50	63	63	63	63	63	63	63

Remark: ★ means no fuse needed.

Overall and Mounting Dimensioned Chart