Selection Information

Class 4141 / Refer to Catalog 4100CT0701

Selection Information

  • Review local utility requirements to ensure that metering equipment meets their standards.

  • Check local utility to determine available fault current at the meter center.

  • Using the SCCR table:

    • Select meter center configuration, main lugs only (Six Disconnect Rule), or remote main, main circuit breaker, or main fusible switch.

    • Read down to select SCCR equal to, or greater than desired rating.

    • Read across to select branch unit tenant circuit breaker type.

    • Continue reading across to select EZM main device type.

UL Listed Meter Center Short-Circuit Current Ratings (SCCR) [1]

Figures

Short Circuit Current Rating
(240 Vac Maximum) [2] [3]

EZM Meter Center Overcurrent Protection Devices

EZM Branch Unit Tenant Circuit Breaker Types Available (Branch Unit Amperes max.,
Number of Poles, Tenant Circuit Breaker
Amperes Rating Range)

EZM Main Device with Integral Mounted Main, Remote Mounted Main or without an Upstream Mounted Main (Six Disconnect Rule)

Figure 1 [4]

EZ Meter-Pak (Six Disconnect Rule Applications)—See Figure 1

 10 kA

QO (125 A, 2P, 40–125 A)

QO (225 A, 2P, 40–125 A) [5]

QB (225 A, 2P or 3P, 70–225 A)

400–2000 A Main Lugs Terminal Box
(Tenant Circuit Breakers used as Service Disconnects—6 maximum)

 22 kA

QO-VH (125 A, 2P, 40–125 A )

QO-VH (225 A, 2P, 40–60 A) [5]

 25 kA

QD (225 A, 2P or 3P, 70–225 A)

 42 kA

QOH (125 A, 2P, 40–125 A)

QOH (225 A, 2P, 40–60 A) [5]

 65 kA

QG (225 A, 2P or 3P, 70–225 A)

100 kA

QJ (225 A, 2P or 3P, 70–225 A) [6]

LJL (125–400 A, 2P or 3P) [7]

Figure 2 [4]

EZ Meter-Pak 225–2000 A Main Lugs Terminal Box Applications Protected by Remote Main—See Figure 2

 10 kA

QO (125 A, 2P, 40–125 A)

QO (225 A, 2P, 40–125 A) [5]

QB (225 A 2P or 3P, 70–225 A)

LJL (125–400 A, 2P or 3P) [7]

Must be protected by an upstream disconnecting means rated 10 k AIR minimum

 22 kA

QO-VH (125 A, 2P, 40–125 A)

QO-VH (225 A, 2P, 40–60 A) [5]

LJL (125–400 A, 2P or 3P) [7]

Must be protected by an upstream disconnecting means rated 22 k AIR minimum

 25 kA

QD (225 A 2P or 3P, 70–225 A)

LJL (125–400 A, 2P or 3P) [7]

Must be protected by an upstream disconnecting means rated 25 k AIR minimum

 42 kA

QOH (125 A, 2P, 40–125 A)

QOH (225 A, 2P, 40–60 A) [5]

LJL (125–400 A, 2P or 3P) [7]

Must be protected by an upstream disconnecting means rated 42 k AIR minimum

QO-VH (125 A, 2P, 40–125 A)

QO-VH (225 A, 2P, 40–60 A) [5]

QD (225 A 2P or 3P, 70–225 A)

Must be protected by a Square DTM circuit breaker Type LA (400 A max.) or MA
(1000 A max.) Rated 42 k AIR minimum

 65 kA

QG (225 A 2P or 3P, 70–225 A)

LJL (125–400 A, 2P or 3P) [7]

Must be protected by an upstream disconnecting means rated 65 k AIR minimum

QO-VH (125 A, 2P, 40–125 A)

QO-VH (225 A, 2P, 40–60 A) [5]

QD (225 A 2P or 3P, 70–225 A)
LJL (125–400 A, 2P or 3P) [7]

Must be protected by a Square D circuit breaker Type LH (400 A max.); MG or MJ (800 A max.); MH (1000 A max.); PG or PJ (1200 A max.); RG or RJ (2000 A max.).

100 kA

QJ (225 A 2P or 3P, 70–225 A ) [6]

LJL (125–400 A 2P or 3P) [7]

Must be protected by an upstream disconnecting means rated 100 k AIR minimum

QO-VH (125 A, 2P, 40–125 A)

QO-VH (225 A, 2P, 40–60 A) [5]

Must be protected by an upstream disconnection means with Class R (600 A max.); Class J (600 A max); Class T6 (800 A max.); Class T3 (1200 A max.) or Class L (1200 A max.).

QD (225 A 2P only, 70–225 A)
LJL (125–400 A, 2P or 3P) [7]

QD (225 A 3P only, 70–225 A) [6]

Must be protected by an upstream disconnection means with Class R (600 A max.); Class J (600 A max); Class T6 (800 A max.); Class T3 (1200 A max.) or Class L (1200 A max.) fuses or by a Square D circuit breaker Type MJ (800 A max.); MHF (1000 A max.); PJ (1200 A max.); or RJ (2000 A max.) rated 100 k AIR minimum.

EZ Meter-Pak—Main Circuit Breaker Applications—See Figure 3

10 kA

QO (125 A, 2P, 40–125 A)

400–2000 A EZM Main Device with Type LH (400 A max.); MG or MJ (800 A max.); MH (1000 A max); PG or PJ (1200 A max.); RG or RJ (2000 A max.)

QO (225 A, 2P, 40–125 A) [5]

QB (225 A 2P or 3P, 70–225 A)

Figure 3 [4]

65 kA

QO-VH (125 A, 2P, 40–125 A)

QO-VH (225 A, 2P, 40–60 A) [5]

QD (225 A 2P or 3P, 70–225 A)

LJL (125–400 A, 2P or 3P) [7]

100 kA

QO-VH (125 A, 2P, 40–125 A)

QO-VH (225 A, 2P, 40–60 A) [5]

QD (225 A 2P only, 70–225 A)

QD (225 A 3P only, 70–225 A) [6]

LJL (125–400 A, 2P or 3P) [7]

1000 A Main Device with catalog number suffix "CBU" supplied with Type MHF circuit breaker.

QD (225 A 2P only, 70–225 A)

QD (225 A 3P only, 70–225 A) [6]

LJL (125–400 A 2P or 3P) [7]

800–2000 A EZM Main Device with Type MJ (800 A max.); MHF (1000 A max.); PJ (1200 A max.) or RJ (2000 A max.)

EZ Meter-Pak—Main Fusible Switch Applications—See Figure 3

10 kA

QO (125 A, 2P, 40–125 A)

QO (225 A, 2P, 40–125 A) [5]

QB (225 A 2P or 3P, 70–225 A)

400–1200 A EZM Main Device (1Ø or 3Ø) with Class T (300 Vac) fuses installed.

100 kA

QO-VH (125 A, 2P, 40–125 A)

QO-VH (225 A, 2P, 40–60 A) [5]

QD (225 A 2P, only, 70–225 A)

QD (225 A 3P only, 70–225 A) [6]

LJL (125–400 A, 2P or 3P) [7]

400–1200 A EZM Main Device (1Ø or 3Ø) with Class T (300 Vac) fuses installed.

Footnotes

  1. Tenant circuit breakers of same frame size having higher AIR values may replace tenant circuit breakers as listed in this table and maintain the series rating.
  2. Meter center short circuit current rating is equal to the lowest short circuit current rating given in table for any circuit breaker installed in any meter panelboard in the meter center.
  3. Short circuit current rating is measured at the LINE SIDE terminals of the integral mounted or remote mounted main providing overcurrent protection for the EZM metering equipment lineup.

  4. For three-tier series ratings refer to Data Bulletin 4100DB0301.
  5. Requires use of EZM125QOA adapter (order separately).

  6. 3P only tenant circuit breaker(s) are limited to: 100 kA Max. at 208Y/120 Vac or 65 kA Max at 240/120 Vac.

  7. Supplied with factory-installed circuit breaker(s), with an adjustable trip range of 125–400 A.

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