NKB8-12, 32, 45 series control and protection switchgear

Product category:: Control and Protective Switching Device (CPS)
Product code:: P-435
Model:: NKB8-12

Function & Use (Application Scenarios)

Electric motor control and protection devices, control and protection switchgear products are mainly applicable to NKB8-12, 32, 45, which are used in AC power systems with a frequency of 50Hz, rated voltage up to 690V, and current ranging from 0.16A to 45A. They can connect, carry, and break normal conditions including specified ones.

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Product highlights

Overload protection is reliable
Short-circuit protection capability
Strong breaking capacity
Control response is stable
Reliable Isolation Protection

Model

NKB8-12

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Main Product Parameters

CategoryRelay Protection and Automation DevicesSecondary CategoryControl and Protection Switchgear

ParametersCurrent frame: 32; Rated operating voltage: ≤690V; Rated operating current: 0.16~32AAdvantages/Core Features01 Has automatic control and panel handle control functions, has panel indication and electrical signal alarm functions, with isolation function

Product details

Function and Application

NKB8-12, 32, 45 are mainly used in AC power systems with a frequency of 50Hz, rated voltage up to 690V, and current from 0.16A to 45A. They can connect, carry, and break the current under normal conditions, including specified operating overload conditions. They can also connect, carry for a specified time, and break the current under specified abnormal conditions, such as short-circuit current.

Detail Description

Parameters:
Current frame: 32
Rated operating voltage: ≤690V
Rated operating current: 0.16~32A

Advantages/Core Functions:
01 Has automatic control and panel handle control functions, has panel indication and electromechanical signal alarm functions, and has isolation function

Detail Parameters

Parameter Category	Parameter Item	Parameter Value
System Parameters	Maximum Rated Current I<sub>max</sub>(A)	12, 32, 45
	Rated Operating Voltage U<sub>e</sub>/V(50Hz)	AC-43, AC-44
	Rated Running Short-Circuit Breaking Capacity I<sub>cs</sub>(kA)	0.63-12, 4.5-32, 11.3-45
	Lifetime (ten thousand times)	50, 4, 150, 120, 45
	Agreed Heating Current I<sub>th</sub>(A)	12, 32, 45
	Rated Insulation Voltage U<sub>i</sub>(V)	690
	Rated Impulse Withstand Voltage U<sub>imp</sub>(kV)	6
	Poles	3
Control and Protection Module Parameters	Control and Protection Module Code	CTU-1 □ 0.63 □, CTU-1 □ 14 □, CTU-1 □ 5 □□, CTU-1 □ 12 □, CTU-1 □ 18 □, CTU-1 □ 32 □, CTU-1 □ 45 □
	Rated Current I<sub>r</sub>(A)	0.63, 1.4, 5, 12, 18, 32, 45
	Overload Protection Setting Current I<sub>r</sub>(A)	0.16-0.63, 0.35-1.4, 1.25-5, 3-12, 4.5-18, 8-32, 11.3-45
	Motor Power for Control at 400V/AC-43(kW)	0.06-0.18, 0.09-0.55, 0.37-2.2, 1.1-5.5, 1.5-7.5, 3-15, 4-22
	Complementary Power Module (Main Body)	PBU-112, PBU-132, PBU-145
Control Method	When A1, A2 is connected to the control power supply, the NK8 can be controlled by the operating handle to close/open. When the handle is rotated to OFF position, NK8 opens. When the handle is rotated to AUTO position, NK8 connects.	-
Protection Function	Short Circuit Instantaneous	16le, 16le, 16le
	Time-Current Overload	12Ir, 6Ir-12Ir adjustable (default 12Ir+OFF T=0.2s), 3Ir-12Ir adjustable (default 12Ir+OFF)
	Overload Inverse Time	√, -, √
	Phase Failure	- Three-phase current imbalance and action time factory set at 50% action time 1s
	Tripping Level	10A, 10E, 20E, 30E (default 10A), 10A, 5E, 10A, 10E, 15, 20E, 25, 30E (default 5E)
	Residual Current	20%le 1s, Fault protection current 20%-50% (default 20%) adjustable + OFF, Fault protection 110%-600% (default 600%) adjustable fault warning 110%-600% rated current (default 500%) adjustable fault protection delay 0.1s-20s (default 5s) adjustable + OFF
	Locked Rotor	- Fault protection 5Ir-9Ir (default 5Ir) adjustable + OFF Fault protection delay 1s-15s (default 2s) adjustable Fault protection 110%-600% (default 250%) adjustable Fault warning 110%-600% (default 500%) adjustable Fault protection delay 0.1s-20s (default 5s) adjustable + OFF
	Blockage	- Fault protection 5Ir-9Ir (default 5Ir) adjustable + OFF Fault protection delay 1s-15s (default 2s) adjustable Fault protection 110%-600% (default 250%) adjustable Fault warning 110%-600% (default 500%) adjustable Fault protection delay 0.1s-20s (default 5s) adjustable + OFF
	Start Timeout	- Delay time 1s-60s (default 3s) adjustable Start time 0s-20s (default 10s) adjustable
	Undervoltage	- Fault protection 20%-80% (default 80%) adjustable + OFF Fault protection delay 1s-60s (default 10s) adjustable Fault protection 20%-90% (default 50%) adjustable Fault warning 20%-90% (default 70%) adjustable Fault protection delay 0.1s-600s (default 5s) adjustable + OFF
	Overvoltage	- Fault protection 70%-90% (default 80%) adjustable + OFF Fault protection delay 1s-30s (default 10s) adjustable Fault protection 110%-130% (default 110%) adjustable + OFF Fault protection delay 1s-30s (default 10s) adjustable
Measurement Function	Three-phase Current	- √ √
	Average Current	- √ √
	Grounding Current	- √ √
	Control Voltage	- - √
	Thermal Capacity	- - √
	Current Unbalance Rate	- - √

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