MasterPacT^™ MTZ Selection

Introduction to MasterPacT MTZ Devices

WARNING: This product can expose you to chemicals including DINP, which is known to the State of California to cause cancer, and DIDP, which is known to the State of California to cause birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov.

MasterPacT MTZ circuit breakers bring smart connectivity and remote monitoring to power distribution systems:

Smartphone connectivity allows easy access to device information.
A Class 1 power meter is built in for energy-saving capabilities.
Can be customized by adding digital modules.
Has the new MicroLogic™ X control unit.
Integrates seamlessly with building and energy management systems.

MasterPacT MTZ Circuit Breaker Overview

MasterPacT MTZ circuit breakers are available in three sizes.

MasterPacT MTZ1 800–1600 A	MasterPacT MTZ2* 800–4000 A	MasterPacT MTZ3 4000–6000 A

MasterPacT MTZ circuit breakers provides a full range of different breaking ratings.

Insulated case devices are listed to UL489 and CSA C22.2 No 5.
Power circuit breakers are certified to ANSI C37 (UL1066) and
CSA C22.2 No 268.

MasterPacT MTZ with ArcBlok™ Technology

The MasterPacT MTZ2 and MTZ3 low-voltage power circuit breaker and insulated case circuit breaker are available with ArcBlok technology designed to mount in an ArcBlok drawout cradle.

The MasterPacT MTZ with ArcBlok technology interfaces with the ArcBlok cradle to prevent arcing events by enclosing the phases at the primary connection of the cradle. If for any reason an arcing event happens, with the separation between phase to phase and phase to ground, the arc is extinguished in less than 12 ms to reduce arc flash energy.

Selecting MasterPacT MTZ Circuit Breakers

Selecting MasterPacT MTZ1 Circuit Breakers

NOTE: Throughout this catalog, UL489 means UL489/CSA C22.2 No 5 and ANSI C37 means ANSI C37/CSA C22.2 No 268.

Ratings for UL489 MasterPacT MTZ1 Circuit Breakers
Frame Rating		800 A					1200 A					1600 A*
Interrupting Rating Code		N	H	L1	L	LF	N	H	L1	L	LF	N	H	L1	L
Number of poles		3/4
Interrupting Current (kAIR)	240 Vac, 60 Hz	50	65	100	200	200	50	65	100	200	200	50	65	100	200
	480 Vac, 60 Hz	50	50	65	100	100	50	50	65	100	100	50	50	65	100
	600 Vac, 60 Hz	35	50	—	—	—	35	50	—	—	—	35	50	—	—
Short-Time Withstand Current Rating (kA)	Vac 60 Hz, 0.5 s	35	35	10	10	10	35	35	10	10	10	35	35	10	10
Built-In Instantaneous Override (Peak kA ±10%)		90	90	22	22	22	90	90	22	22	22	90	90	22	22
Close and Latch Ratings (Peak kA)	Vac 60 Hz	55	55	22	22	22	55	55	22	22	22	55	55	22	22
Tested to show arc flash hazard risk category as referenced by NFPA70E		—	—	—	—	Yes	—	—	—	—	Yes	—	—	—	—
Breaking Time		25 to 30 ms (with no intentional time delay) 9 ms for L and LF
Closing Time		< 50 ms
Sensor Rating		400–800 A					600–1200 A					800–1600 A
Endurance Rating (C/O Cycles) (with no maintenance)	Mechanical	12,500
Endurance Rating (C/O Cycles) (with no maintenance)	Electrical	2,800

Ratings for ANSI C37 Certified MasterPacT MTZ1 Circuit Breakers
Frame Rating		800 A
Interrupting Rating Code		N1
Number of Poles		3/4
Interrupting Current (kAIR)	254 Vac 60 Hz	42
	508 Vac 60 Hz	42
	635 Vac 60 Hz	—
Short-Time Withstand Current (kA)	Vac 60 Hz, 0.5 s	42
Built-In Instantaneous Override (Peak kA ±10%)		—
Close and Latch Ratings (Peak kA)	Vac 60 Hz	90
Tested to show arc flash hazard risk category as referenced by NFPA70E		—
Breaking Time (with no intentional time delay)		25 to 30 ms
Closing Time		< 50 ms
Sensor Rating		400 to 800 A
Endurance Rating (C/O Cycles) (with no maintenance)	Mechanical	12,500
Endurance Rating (C/O Cycles) (with no maintenance)	Electrical	2800

Ratings for IEC 60947-2 Rated MasterPacT MTZ1 Circuit Breakers
Frame Rating			800/1000 A				1250/1600 A
Interrupting Rating Code			H1	H2	H3	L1	H1	H2	H3
Ultimate Breaking Capacity (kA)	Icu	220/415 Vac, 50/60 Hz	42	50	65	150	42	50	65
		440 Vac, 50/60 Hz	42	50	65	130	42	50	65
		525 Vac, 50/60 Hz	42	42	—	100	42	42	—
		690 Vac, 50/60 Hz	42	42	—	25	42	42	—
		1150 Vac, 50/60 Hz	—	—	—	—	—	—	—
Service Breaking Capacity (kA)	Ics	%Icu	100%	100%	75%	100%	100%	100%	75%
Short-Time Withstand Current (kA)	Icw	Vac 50/60 Hz, 1 s	42	42	50	10 x In	42	42	50
Built-In Instantaneous Override (kA ±10%)			—	90	110	10	—	—	110
Rated Making Capacity (Peak kA)	Icm	220/415 Vac, 50/60 Hz	88	105	145	330	88	105	145
		440 Vac, 50/60 Hz	88	105	145	286	88	105	145
		525 Vac, 50/60 Hz	88	88	—	200	88	88	—
		690 Vac, 50/60 Hz	88	88	—	52	88	88	—
		1000 Vac, 50/60 Hz	—	—	—	—	—	—	—
Breaking Time		ms	25 to 30 ms (with no intentional time delay) 9 ms for L and LF
Closing Time		ms	50
Sensor Rating			400 to 800 A
Endurance Rating (C/O cycles) (with no maintenance)		Mechanical	12,500	12,500	10,000	12,500	12,500	12,500	10,000
		Electrical 440 V	6000	6000	6000	3000	6000	6000*	6000*
		Electrical 1000 V	—	—	—	—	—	—	—

Selecting MasterPacT MTZ2 Circuit Breakers

Ratings for UL489 MasterPacT MTZ2 Circuit Breakers*
Frame Rating		800/1200/1600/2000 A				2500/3000 A
Interrupting Rating Code		N	H	L	LF	H	L
Number of Poles		3/4
Interrupting Current (kAIR)	240 Vac 50/60 Hz	65	100	200	200	100	200
	480 Vac 50/60 Hz	65	100	150	150	100	150
	600 Vac 50/60 Hz	50	85	100	100	85	100
Short-Time Withstand Current (kA)	Vac 50/60 Hz, 0.5 s	42	65	3065 kA for 2000 A.*	22	65	65
Built-In Instantaneous Override (Peak kA ±10%)		90	90	80	55	150	150
Close and Latch Ratings (Peak kA)	Vac 50/60 Hz	90	90	5590 kA for 2000 A.*	50	90	90
Tested to show arc flash hazard risk category (NFPA70E)		—	—	—	Yes	—	—
Breaking Time		25 to 30 ms (with no intentional delay) 9 ms for L and LF
Closing Time		70 ms
Sensor Rating		400–800 A / 600–1200 A / 800–1600 A / 1000–2000 A				1200–2500 A / 1600–3000 A
Endurance Rating (C/O Cycles) (with no maintenance)	Mechanical	12,500*	12,500*	12,500*	12,500*	10,000	10,000
Endurance Rating (C/O Cycles) (with no maintenance)	Electrical	2800*	2800*	2800*	2800*	1000	1000

Ratings for ANSI C37 Certified MasterPacT MTZ2 Circuit Breakers*
Frame Rating		800/1600 A							2000 A						3200/4000 A*
Interrupting Rating Code		N1	H1	H2	H3	IRC = H10	L1* *	L1F*	H1	H2	H3	IRC = H10	L1* *	L1F*	H1	H2	H3	IRC = H10	L1* *
Number of Poles		3/4
Interrupting Current (kAIR) (50/60 Hz)	254 Vac	42	65	85	100		200	200	65	85	100		200	200	65	85	100		200
	508 Vac	42	65	85	100		200	200	65	85	100		200	200	65	85	100		200
	730 Vac
	635 Vac	42	65	85	85		130	130	65	85	85		130	130	65	85	85		130
Short-Time Withstand Current (kA) (50/60 Hz)	Vac, 0.5 s	42	65	85	85		30	22	65	85	85		30	22	65	85	85		100
Built In Instantaneous Override (Peak kA ±10%)		—	—	—	190		80	55	—	—	190		80	55	—	—	190		270
Close and Latch Ratings (Peak kA)	Vac (50/60 Hz)	90	150	90	90		55	50	150	90	90		55	50	150	90	90		90
Tested to show arc flash hazard risk category (NFPA70E)		—	—	—	—		—	Yes	—	—	—		—	Yes	—	—	—		—
Breaking Time		25 to 30 ms (with no intentional delay) 9 ms for L1 and L1F
Closing Time		70 ms
Sensor Rating		400–800 A, 800–1600 A							1000–2000 A						1600–4000 A
Endurance Rating (C/O Cycles) (with no maintenance)	Mechanical	12,500							10,000						10,000				5000
Endurance Rating (C/O Cycles) (with no maintenance)	Electrical	2800							1000						1000				1000

Ratings for IEC60947–2 Rated MasterPacT MTZ2 Circuit Breakers
Frame Rating			800/1000/1250/1600 A					2000 A						2500/3200/4000 A
Interrupting Rating Code			N1	H1	H2	L1	H10	N1	H1	H2	H3	L1	H10	H1	H2	H3	H10
Ultimate Breaking Capacity (kA) 50/60 Hz	Icu	220/415 Vac	42	65	100	150	—	42	65	100	150	150	—	65	100	150	—
		440 Vac	42	65	100	150	—	42	65	100	150	150	—	65	100	150	—
		525 Vac	42	65	85	130	—	42	65	85	130	130	—	65	85	130	—
		690 Vac	42	65	85	100	—	42	65	85	100	100	—	65	85	100	—
		1150 Vac	—	—	—	—	50	—	—	—	—	—	50	—	—	—	50
Service Breaking Capacity (%)	Ics	% Icu	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100
Short-Time Withstand Current (kA)	Icw	Vac 50/60 Hz, 1 s	42	65	85	30	50	42	65	85	65	30	50	65	85	65	50
Short-Time Withstand Current (kA)	Icw	Vac 50/60 Hz, 3 s	22	36	50	30	50	22	36	75	65	30	50	65	75	65	50
Built-In Instantaneous Override (Peak kA ±10%)			—	—	190	80	—	—	—	190	150	80	—	—	190	150	—
Rated making Current (Peak kA) 50/60 Hz	Icm	220/415 Vac	88	143	220	330	—	88	143	220	330	330	—	143	220	330	—
		440 Vac	88	143	220	330	—	88	143	220	330	330	—	143	220	330	—
		525 Vac	88	143	187	286	—	88	143	187	286	286	—	143	187	286	—
		690 Vac	88	143	187	220	—	88	143	187	220	220	—	143	187	220	—
		1150 Vac	—	—	—	—	105	—	—	—	—	—	105	—	—	—	105
Breaking Time		ms	25	25	25	10	25	25	25	25	25	10	25	25	25	25	25
Closing Time		ms	< 70					< 70						< 70
Sensor Rating			400–800 A / 800–1600 A					1000–2000 A						1600–4000 A
Endurance Rating (with no maint.) (C/O Cycles x 1000)		Mechanical	12.5					10						10
		Electrical 440 V	10	10	10	3	—	8	8	8	3	3	—	5	5	1.25	—
		Electrical 1150 V	—	—	—	—	0.5	—	—	—	—	—	0.5	—	—	—	0.5

Selecting MasterPacT MTZ3 Circuit Breakers

Ratings for UL489 MasterPacT MTZ3 Circuit Breakers*
Frame Rating		4000/5000/6000 A
Interrupting Rating Code		H	L
Number of Poles		3/4
Interrupting Current (kAIR)	240 Vac 50/60 Hz	100	200
	480 Vac 50/60 Hz	100	150
	600 Vac 50/60 Hz	85	100
Short-Time Withstand Current (kA)	Vac 50/60 Hz, 0.5 s	85	100
Built-In Instantaneous Override (Peak kA ±10%)		170	170
Close and Latch Ratings (Peak kA)	Vac 50/60 Hz	90	90
Tested to show arc flash hazard risk category (NFPA70E)		—	—
Breaking Time		25 to 30 ms (with no intentional delay) 9 ms for L
Closing Time		70 ms
Sensor Rating		2000–4000 A 2500–5000 A 3000–6000 A
Endurance Rating (C/O Cycles) (with no maintenance)	Mechanical	5000	5000
Endurance Rating (C/O Cycles) (with no maintenance)	Electrical	1000	—

Ratings for ANSI C37 Certified MasterPacT MTZ3 Circuit Breakers *
Frame Rating		4000/500/6000 A
Interrupting Rating Code		H2	H3	L1* *
Interrupting Current (kAIR) (50/60 Hz)	254 Vac	85	100	200
	508 Vac	85	100	200
	635 Vac	85	85	130
Short-Time Withstand Current (kA) (50/60 Hz)	Vac, 0.5 s	85	85	100
Built In Instantaneous Override (Peak kA ±10%)		—	—	270
Close and Latch Ratings (Peak kA) (50/60 Hz)	Vac	170	170	90
Tested to show arc flash hazard risk category (NFPA70E)		—	—	—
Breaking Time		25 to 30 ms (with no intentional delay) 9 ms for L1
Closing Time		70 ms
Sensor Rating		2000–4000 A 2500–5000 A 3000–6000 A
Endurance Rating (C/O Cycles) (with no maintenance)	Mechanical	5000
Endurance Rating (C/O Cycles) (with no maintenance)	Electrical	1000

Ratings for IEC60947–2 Rated MasterPacT MTZ3 Circuit Breakers
Frame Rating			4000/5000/6300 A
Interrupting Rating Code			H1	H2
Ultimate Breaking Capacity (kA) 50/60 Hz	Icu	220/415 Vac	100	150
		440 Vac	100	150
		525 Vac	100	130
		690 Vac	100	100
		1150 Vac	—	—
Service Breaking Capacity	Ics	%Icu	100%	100%
Short-Time Withstand Current (kA)	Icw	Vac 50/60 Hz, 1 s	100	100
Short-Time Withstand Current (kA)	Icw	Vac 50/60 Hz, 3 s	100	100
Built-In Instantaneous Override (Peak kA ±10%)			—	117
Rated making Current (Peak kA) 50/60 Hz	Icm	220/415 Vac	220	330
		440 Vac	220	330
		525 Vac	187	286
		690 Vac	187	220
		1150 Vac	—	—
Breaking Time			25 ms
Closing Time		ms	< 80
Sensor Rating			2000–4000 A 2500–5000 A 3000–6000 A
Endurance Rating (with no maint.) (C/O Cycles x 1000)		Mechanical	5
		Electrical 440 V	1.5	1.5
		Electrical 1150 V	—	—

Selecting MasterPacT MTZ Switches

Selecting MasterPacT MTZ1 Switches

Ratings for ANSI C37 Certified MasterPacT MTZ1 Non-Automatic Switches
Frame Rating		800 A
Withstand Rating Code		NA
Short-Time Withstand Current Rating (kA)	Vac 50/60 Hz, 0.5 s	42
Breaking Capacity (with external protection relay) (kA)	254 Vac, 60 Hz	42
	508 Vac, 60 Hz	42
	635 Vac, 60 Hz	NA

Ratings for IEC 60947-3 Rated Non-Automatic MasterPacT MTZ1 Switches
Frame Rating			800/1000 A	1250/1600 A
Withstand Rating Code			HA	HA
Rated Making Capacity (Peak kA)	Icm	220/415 Vac, 50/60 Hz	75	75
		440 Vac, 50/60 Hz	75	75
		500/690 Vac, 50/60 Hz	75	75
		1000 Vac, 50/60 Hz	—	—
Short-Time Withstand Current (kA)	Icw	Vac 50/60 Hz, 0.5 s	36	36
Breaking Capacity (kA at 690 Vac) (with external protection relay)	Icu	Maximum delay 350 ms	36	36

Selecting MasterPacT MTZ2 Switches

Ratings for ANSI C37 Certified MasterPacT MTZ2 Non-Automatic Switches
Frame Rating		800 A	1600 A	2000 A	3200 A	4000 A
Withstand Rating Code		HA	HA	HA	HA	HA
Breaking Capacity with External Relay (kA), 50/60 Hz	254 Vac	65	65	65	65	65
	508 Vac	65	65	65	65	65
	635 Vac	65	65	65	65	65
Short-Time Withstand Current (kA) Vac 50/60 Hz, 0.5 s		65	65	65	65	65

Ratings for IEC 60947-3 Rated MasterPacT MTZ2 Non-Automatic Switches
Frame Rating			800/1000/1250/1600 A		2000 A	2500/3200/4000 A
Withstand Rating Code			NA	HA	HA	HA
Rated Making Current 50/60 Hz (Peak kA)	Icm	220/415 Vac	88	145	145	145
		440 Vac	88	145	145	145
		500/690 Vac	88	145	145	145
		1150 Vac	—	—	—	—
Short-Time Withstand Current (kA)	Icw	Vac 50/60 Hz, 1 s	42	66	66	66
Ultimate Breaking Capacity (with external protection relay) (kA)	Icu	Maximum Delay 400 ms	42	66	66	66

Selecting MasterPacT MTZ3 Switches

Ratings for ANSI C37 Certified MasterPacT MTZ3 Non-Automatic Switches
Frame Rating		4000 A	5000/6300 A
Withstand Rating Code		HA	HA
Breaking Capacity with External Relay (kA), 50/60 Hz	254 Vac	85	85
	508 Vac	85	85
	635 Vac	85	85
Short-Time Withstand Current (kA) Vac 50/60 Hz, 0.5 s		85	85

Ratings for IEC 60947-3 Rated MasterPacT MTZ3 Non-Automatic Switches
Frame Rating			4000B/5000/6300 A
Withstand Rating Code			HA
Rated Making Current (Peak kA)	Icm	220/415 Vac, 50/60 Hz	187
		440 Vac, 50/60 Hz	187
		500/690 Vac, 50/60 Hz	187
		1150 Vac, 50/60 Hz	—
Short-Time Withstand Current (kA)	Icw	Vac 50/60 Hz, 1 s	85
Ultimate Breaking Capacity (with external protection relay) (kA)	Icu	Maximum Delay 400 ms	85

MasterPacT™ MTZ Selection