CHINT NXM-800/3P 800A Moulded Case Circuit Breaker

Full Model Name: NXM-800S/3300 In800A

NXM is the Kunlun series MCCB from CHINT.

Frame size: 800A, 3-pole, rated current In=800A.

It provides overload, short-circuit and under-voltage protection for low-voltage distribution circuits, and can also be used for infrequent motor starting & stopping protection.

✅ Model Code Breakdown

NXM: Kunlun moulded case circuit breaker series

800: Frame size (max rated current of the housing)

S/F/H: Breaking capacity grade

S: Standard type, Icu=36kA @ 400V

F: Medium high breaking capacity, Icu=50kA @ 400V

H: High breaking capacity, Icu=70kA @ 400V

3: 3 poles (3-phase, no neutral pole)

3300: Thermal-magnetic trip, no built-in accessories (standard configuration)

In800: Rated operating current 800A

📌 Core Electrical Parameters

Rated operational voltage Ue: AC400V / 690V, 50Hz

Rated insulation voltage Ui: 1000V

Rated impulse withstand voltage Uimp: 12kV

Trip unit: 3300 = thermal-magnetic type (long-time delay overload + instantaneous short-circuit protection)

Utilization category: Category A (no short-time delay)

Mounting: Front wired (standard); rear wired / plug-in type optional

Ingress protection: IP30 for the breaker body

Compliance standards: GB/T 14048.2, IEC 60947-2; with CCC certification

📐 Overall Dimensions & Mounting (NXM-800 3P)

Width: 210 mm

Height: 340 mm

Depth: 110 mm

Mounting hole pitch: Horizontal 180 mm, vertical 80 mm

Suitable for main incoming feeder & large branch protection in GGD, GCS power cabinets.

🧩 Optional Built-in Accessories (Order Separately)

Shunt release MX (remote trip)

Under-voltage release MN (trips on power loss)

Auxiliary contact AX, Alarm contact AL

Motor operating mechanism P (electric closing & tripping)

Phase barriers, terminal shrouds, extended cable lugs

Model example with accessories: NXM-800S/3340 800A (shunt release + auxiliary contact)

⚠️ Selection & Replacement Guide

1. If short-time delay, communication or four-remote control is required, do not select the standard thermal-magnetic NXM. Upgrade to NXMS / NXMNS electronic MCCB.
2. Competitor cross-reference: Schneider CVS800, ABB T6 800, Delixi CM1-800.
3. Domestic alternative: CHNT NM1-800, NM8S-800.
4. Important note: 800A is a high-current MCCB. The incoming copper busbar should be at least 80×8 mm; temperature rise & short-circuit withstand capacity of busbars must be verified in cabinet design.

Special note: NXM-800 has no F grade; only S (36kA) and H (70kA) are available. F grade only applies to smaller frame sizes.

1. Model Coding Rule (NXM-800/3P, thermal-magnetic trip, code starts with 3)

NXM-800【S/H】【P/Z】/3【3-digit accessory code】 In800A

Operation code: No letter = manual handle; P = motor operation; Z = rotary door handle

3P thermal-magnetic accessory codes (valid for NXM-800 frame):

1. Basic Bare Breaker Order Models (Manual, No Accessories)

1) Standard breaking capacity S type (Icu=36kA @400V)

NXM-800S/3300 800A (most common for main incoming feeders)

2) High breaking capacity H type (Icu=70kA @400V)

NXM-800H/3300 800A (for distribution rooms with high short-circuit current)

Reminder: NXM-800 does NOT have F breaking grade; never select F.

III. Complete Order Models with Built-in Accessories (3P, In800A)

1) Manual Operation (No P/Z suffix)

Only shunt release (remote trip): NXM-800S/3310 800A

Only auxiliary contact (status feedback): NXM-800S/3320 800A

Only under-voltage release (trip on power failure): NXM-800S/3330 800A

Shunt release + auxiliary contact (most popular remote control): NXM-800S/3340 800A

Shunt release + under-voltage release: NXM-800S/3350 800A

Auxiliary contact + alarm contact: NXM-800S/3328 800A

Shunt release + auxiliary + alarm contact: NXM-800S/3348 800A

Replace S with H for high breaking capacity version, e.g. NXM-800H/3340 800A.

2) With Motor Operating Mechanism (Add suffix P)

Motor operated, no accessory: NXM-800SP/3300 800A

Motor operated + shunt release + auxiliary contact: NXM-800SP/3340 800A

High breaking capacity motor operated: NXM-800HP/3300 800A

3) Door Rotary Handle (Add suffix Z)

NXM-800SZ/3300 800A; NXM-800HZ/3340 800A

1. External Accessories (Ordered Separately, Not Included in Main Model Code)
2. Wiring type: Rear connection RCP, plug-in type PIA
3. Fittings: Phase barriers, terminal shrouds, extended copper cable lugs
4. Coil voltage selection (MX shunt release / MN under-voltage release): AC220V, AC380V, DC24V, DC220V
5. Standard Order List (Copy directly for purchasing)
6. Standard incoming feeder (no accessory): NXM-800S/3300 800A
7. Remote trip + breaker status feedback: NXM-800S/3340 800A (MX+AX)
8. Under-voltage protection + remote trip: NXM-800S/3350 800A (MX+MN)
9. Motor closing + remote trip: NXM-800SP/3340 800A
10. Supplementary Notes

Trip unit: Code starting with 3 = fixed thermal-magnetic trip (long-time delay overload + instantaneous short-circuit, no short-time delay). If short-time delay or communication is required, select NXMS electronic MCCB instead.

Rated current: NXM-800 frame only has one rating: In=800A, non-adjustable.

Full NXM Thermal-Magnetic MCCB Series (11 Frame Sizes)

Breaking grades: E/S/F/H. Exception: NXM-800 only has S & H, no F grade.

1. Model Coding Rule (Thermal-Magnetic, Code Starts with 3)

NXM-Frame Size【Breaking Grade】【Operation】/Poles + Accessory Code Rated Current

Breaking grade: E(15kA), S(25~36kA), F(36~50kA), H(50~70kA)

Operation: No letter = manual; P = motor operation; Z = door rotary handle

Poles: 2P/3P/4P; Thermal-magnetic accessory codes: 3300/3310/3320/3330/3340…

1. Frame Sizes & Rated Current List (Order Reference)

1) NXM-63 (2P/3P/4P, E/S/H, no F)

Rated current: 10, 16, 20, 25, 32, 40, 50, 63A

Base model: NXM-63S/3300 63A

2) NXM-125 (2P/3P/4P, E/S/F/H)

Rated current: 10, 16, 20, 25, 32, 40, 50, 63, 80, 100, 125A

Base model: NXM-125S/3300 125A

3) NXM-160 (2P/3P/4P, S/F/H)

Rated current: 32, 40, 50, 63, 80, 100, 125, 140, 160A

Base model: NXM-160S/3300 160A

4) NXM-250 (2P/3P/4P, S/F/H)

Rated current: 125, 140, 160, 180, 200, 225, 250A

Base model: NXM-250S/3300 250A

5) NXM-320 (3P/4P, S/F/H)

Rated current: 250, 280, 300, 315, 320A

Base model: NXM-320S/3300 320A

6) NXM-400 (3P/4P, E/S/F/H)

Rated current: 250, 280, 300, 315, 350, 400A

Base model: NXM-400S/3300 400A

7) NXM-630 (3P/4P, E/S/F/H)

Rated current: 400, 500, 600, 630A

Base model: NXM-630S/3300 630A

8) NXM-800 (3P/4P, only S & H, no F, your selected model)

Rated current: Only 800A (single rating)

Base models: NXM-800S/3300 800A, NXM-800H/3300 800A

9) NXM-1000 (3P/4P, S/H)

Rated current: 800, 1000A

Base model: NXM-1000S/3300 1000A

10) NXM-1250 (3P/4P, S/H)

Rated current: 1000, 1250A

Base model: NXM-1250S/3300 1250A

11) NXM-1600 (3P/4P, S/H)

Rated current: 1250, 1600A

Base model: NXM-1600S/3300 1600A

III. Universal Built-in Accessory Code Table (3P Thermal-Magnetic, Full Series Applicable)

1. Full-Series Model Templates with Operating Mechanism
2. Motor operation (add P): NXM-250SP/3340 250A
3. Door rotary handle (add Z): NXM-400SZ/3300 400A
4. High breaking H type: NXM-630H/3340 630A
5. External Independent Accessories (Ordered Separately, Not Printed on Main Model)

Wiring option: Rear connection RCP, plug-in type PIA

Fittings: Phase barriers, terminal shrouds, extended copper lugs

Coil voltage: AC220V, AC380V, DC24V, DC220V

1. Derivative Models of the Same Series
2. NXMS: Electronic MCCB (short-time delay, adjustable current, communication function; frame size 160~1600A)
3. NXMLE: Earth leakage MCCB (with residual current protection)
4. NXHM: Isolating switch (no trip unit, only for isolation)

Ready-to-use Order Models for NXM-800

Bare breaker without accessory: NXM-800S/3300 800A, NXM-800H/3300 800A

Remote trip + status feedback: NXM-800S/3340 800A

Motor operation + remote trip: NXM-800SP/3340 800A

Under-voltage protection: NXM-800S/3350 800A