NDB2ZB-63 Series Miniature Circuit Breaker

Home / Products / MCB / NDB2ZB-63 Series Miniature Circuit Breaker

Updated：July 17,2026 17:50PM

The NDB2ZB-63 Series miniature circuit breaker provides three-stage protection including long-time delay overload protection short-time delay short-circuit protection and instantaneous short-circuit protection. It can be used in DC distribution systems with rated operational current below 63A enabling full selective protection with downstream circuit breakers. While ensuring short-circuit fault protection it effectively avoids misoperation of the upstream circuit breaker caused by downstream short-circuit current ensuring safe and reliable system operation. It also provides an isolation function.
2021 Quick Selection Guide »

Features of NDB2ZB-63 Series

Box-type terminal structure for reliable wiring.
Compatible with multiple accessories for easy functional expansion.
Modular and standardized design for flexible combinations.

Technology data of NDB2ZB-63 Series

Specification	NDB2ZB-63
Rated operational voltage (V)	DC220/250 DC440
Rated insulation voltage (V)	1000
Rated impulse withstand voltage (kV)	4
Rated current (A)	16, 20, 25, 32, 40, 50, 63
Rated ultimate short-circuit breaking capacity (kA)	DC220/250V: 10 (H: 20kA) DC440V: 10 (H: 20kA)
Rated service short-circuit breaking capacity (kA)	DC220/250V: 10 (H: 20kA) DC440V: 10 (H: 10kA)
Instantaneous tripping characteristic (In)	8: no tripping within 200 ms 10: tripping within 10–40 ms 1680A: tripping within <6 ms
Number of poles (P)	2
Operating performance	Mechanical life: 20,000 operations Electrical life: 1,500 operations

Tags:

Prev：NDB5E-80 loT Series Miniature Circuit Breaker

Next：NDB3-125 Series Miniature Circuit Breaker

INQUIRY NOW

Name *

Email *

Message*

Captcha*

RELATED PRODUCTS

NDP1A Series Distribution Box

Nader NDP1A series concealed distribution box is applicable to indoor AC 50Hz or 60Hz, rated working voltage 220V to 440V, generally not exceeding 35 ℃ and occasionally reaching 60 ℃. It is used to provide protection for circuit breakers, switches, sockets and other electrical accessories against external influences (such as mechanical impact, invasion of liquid substances, etc.). The product can be widely used in the enclosure of electrical accessories for household and building fixed electrical devices.

NDB6AZ-63 Series Miniature Circuit Breaker

Nader NDB6AZ-63H series MCB is mainly used in telecommunication machine room or communication cabinet with DC rated working voltage of 80V and below and rated working current of 4A to 63A (only for industrial use), as isolation, short circuit and overload protection of cabinet, machine room or downstream user line.

NDB3-125 Series Miniature Circuit Breaker

The NDB3-125 Series miniature circuit breaker is suitable for power systems with rated current from 10A to 125A and rated voltage of AC230V/240V AC400V/415V (50/60Hz) or DC80V/DC125V and below. It is used for overload and short-circuit protection and can also be used for infrequent making and breaking operations. It is widely applied in computers and peripheral equipment industrial automation systems telecommunication equipment general power supply systems UPS systems railway locomotives marine electrical systems aerospace applications elevator control systems and mobile power equipment.