Key Specifications/ Special Features:

Applicable scope and purpose

● Short -circuit protection

● Over-load protection

● Control

● Isolation

● DC system protection

NDB2T-63(UL489)dedicated to the low voltage power distribution system of industrial, buildings, energy communications and infrastructure.

Main technical specification

● Electrical parameters

○ Rated working voltage and relevant breaking capacity:

Pole		1P	2P	3P	1P	2P	3P
Rating current		1~32A			35~63A
Item		Icu
Voltage	AC 120V	10kA	—	—	10kA	—	—
	AC 240V	—	10kA	10kA	—	10kA	10kA
	AC 277V	10kA	—	—	—	—	—
	AC 480Y/277V	—	10kA	10kA	—	—	—
	DC60V	10kA	10kA	—	10kA	10kA	—
	DC125V	—	10kA	—	—	10kA	—

○ Impulse withstand test voltages: 4kV

○ electrical endurance: 10000 times；Mechanical endurance: 20000 times

●  Product certification and implementation standard.：

○ Product certificate：UL489;

○ Product certification standard：UL489;

●  Environmental requirements：RoHS

●  Isolation function

○ Practical breaking instructions

○ View window within the green identification said contact in the off position

●  Tripping characteristic B type curve

○   Protection of short circuit current small load

○   rated current：1A～63A

○   tripping characteristic：The instantaneous tripping range 4In（1±20%） C type curve

○  Protect normal load and distribution wire cable

○   rated current：1A～63A

○   tripping characteristic：The instantaneous tripping range 8In（1±20%） D type curve

○   Protect starting current big impact load（Such as motor, transformer）

○   rated current：1A～63A

○   tripping characteristic：The instantaneous tripping rang 12In（1±20%）

5、Normal working environment

● Ambient temperature：-40℃～+70℃

● Air relative humidity：≤95%

● Altitude：≤2000m

● pollution degree: 3

● Service place without significant vibration and impact

● Lower capacity coefflcient table above 2000 meters above sealevel

● Side-by-side volume reduction coefflcient table

6.  Tripping characteristic

7、Outline dimensions

                                                                   3P

8、Mounting

Modular construction，can be installed in EN60715 TH 35mm x 7.5mm standard guide rail.

9、Connect line requirements

^{○    Standard cross-sections of round copper conductors: 1~35mm2}

○  Terminal screw: M5 ,Rated torque : 2.0N.m

11 、 Notice

1、Customers who disassemble the product without approval shall undertake relevant quality problems by themselves;

2、Do not touch the naked part of conductive components when the product is power on;

3、Don’t test characteristics of the breaker optionally, the manufacturer is irresponsible for such quality problems;

4、Keep wiring correct to prevent malfunction or damage of wiring terminals.

5、Please open the cover when installing the accessory. Please refer to OF2, SD2, MX+OF2 Instruction for details.