Quick answer: Eaton BZMX and NZM molded case circuit breakers (MCCBs) cover feeders from 63A to 250A in this guide. The BZMX models (80A, 100A and 250A) are built for solar, mining, motor and power-distribution protection, with 15 kA breaking capacity at 415V AC. The NZMB1-A63-NA is a compact 63A breaker rated 25 kAIC at 480VAC. Shansen Traders, an authorized Eaton channel partner in Coimbatore, lists all five on KovaiGuide.
If you are searching for an Eaton MCCB for a panel, a solar plant, a mine or a motor feeder, the model codes alone can be confusing. What does BZMX2E-3-AX80-S08 mean? When do you need a microprocessor trip unit instead of a thermal-magnetic one? This guide answers those questions in plain language and compares five Eaton MCCBs available through Shansen Traders in Coimbatore.
What Is an MCCB and What Does It Do?
An MCCB (Molded Case Circuit Breaker) is a protective device that automatically disconnects a circuit during an overload or a short circuit. It sits in a sealed, insulated molded case and is used where ordinary miniature circuit breakers (MCBs) run out of capacity, typically above 100A. It does three jobs:
- Overload protection: a thermal element trips when current stays too high for too long.
- Short-circuit protection: a magnetic element trips almost instantly on a fault current.
- Manual isolation: the handle lets you switch the circuit on and off safely.
Eaton MCCB Models at a Glance
All five breakers below are 3-pole models.
| Model / SKU | Rated current | Trip unit | Breaking capacity | Best for |
|---|---|---|---|---|
| BZMX2E-3-AX250-S08 | 250A | Thermal-magnetic or microprocessor (LSI / LSIG) | 15 kA / 36.5 kA (variant dependent) | Solar, motor and power distribution |
| BZMX3E-3-AX400-500 | 100A | Thermomagnetic, fixed release | 15 kA (Icu) | General feeders, wide temperature range |
| BZMX2E-3-AX80-S08 | 80A | Thermal-magnetic (LI) | 15 kA at 415V AC (up to 36.5 kA) | Solar and mining duty |
| BZMX2E-3-AX100-S08 | 100A | Thermal-magnetic (LI) | 15 kA at 415V AC (up to 36.5 kA) | Solar and mining duty |
| NZMB1-A63-NA | 63A at 480VAC | Thermal-magnetic (T268) | 25 kAIC | Compact panels and machine feeders |
The Five Eaton MCCBs in Detail
Eaton BZMX2E-3-AX250-S08: 250A for solar, motor and distribution
This 3-pole, 250A breaker from the BZMx series suits a higher-rated incomer or main feeder. It is the most flexible model here because the BZMx series offers both thermal-magnetic and microprocessor trip units.
- Rated current: 250A (the BZMx series spans 10A to 630A)
- Breaking capacity: 15 kA / 36.5 kA depending on variant
- Trip units: thermal-magnetic, or microprocessor with LSI / LSIG protection
- Applications: solar, motor and power distribution protection
- SKU: BZMX2E-3-AX250-S08
What do LSI and LSIG mean? L is long-time (overload) protection, S is short-time delay, I is instantaneous short-circuit protection and G is ground-fault protection. The short-time delay lets a breaker closest to the fault trip first, so the rest of your plant keeps running. This is called selectivity.
Eaton BZMX3E-3-AX400-500: 100A with a wide temperature range
A 3-pole, 100A MCCB with a thermomagnetic fixed release, built to IEC 60947-2.
- Rated current: 100A, thermomagnetic fixed release
- Rated voltage: up to 690V, with 1150V insulation and 8 kV impulse withstand
- Breaking capacity: 15 kA (Icu)
- Protection degree: IP10
- Operating temperature: -40°C to +70°C
- SKU: BZMX3E-3-AX400-500
The -40°C to +70°C range suits outdoor enclosures, rooftop solar panels and industrial sites where temperatures swing widely.
Eaton BZMX2E-3-AX80-S08: 80A for solar and mining duty
- Rated current: 80A, 3-pole
- Breaking capacity: 15 kA at 415V AC (up to 36.5 kA)
- Trip unit: thermal-magnetic (LI)
- Mounting: plug-in, Frame 2
- Accessories supported: undervoltage release (UVR), shunt trip, auxiliary contacts
- Approvals: IEC 60947-2, CE
- SKU: BZMX2E-3-AX80-S08
Eaton BZMX2E-3-AX100-S08: 100A for solar and mining duty
- Rated current: 100A, 3-pole
- Breaking capacity: 15 kA at 415V AC (up to 36.5 kA)
- Trip unit: thermal-magnetic (LI)
- Mounting: plug-in, Frame 2
- Accessories supported: UVR, shunt trip
- Approvals: IEC 60947-2, CE
- SKU: BZMX2E-3-AX100-S08
Why plug-in mounting helps: the AX80 and AX100 share the same Frame 2 design and differ only in rating. A plug-in breaker can be removed and replaced without disturbing the base wiring, which cuts downtime on a solar or mining site. The accessory-ready design also lets you add remote tripping (shunt trip) or automatic disconnection on voltage loss (UVR) later without replacing the breaker.
Eaton NZMB1-A63-NA: compact 63A, 25 kAIC
This breaker comes from Eaton’s NZM family. It is a compact 3-pole MCCB in the NZM1 frame, rated 63A at 480VAC, and has the highest short-circuit rating of the five.
- Rated current: 63A at 480VAC
- Breaking capacity: 25 kAIC
- Trip type: thermal-magnetic (T268)
- Overload protection range: 50A to 63A
- Connection: front frame clamp with rocker lever
- Country of origin: Romania
- SKU: NZMB1-A63-NA
The adjustable 50A to 63A overload range lets you fine-tune protection to the actual load, which helps on small motors and machine feeders.
How to Choose the Right Eaton MCCB in 6 Steps
Step 1: Match the rated current to your load
Choose a breaker rated above your continuous load current, and allow for high ambient temperatures inside the panel.
Step 2: Check the breaking capacity
The breaker must be rated at or above the prospective short-circuit current at the point of installation. A 15 kA breaker on a point with a 25 kA fault level is unsafe.
Step 3: Pick the trip unit
Thermal-magnetic is simple and economical. Choose a microprocessor (LSI / LSIG) unit when you need adjustable settings, selectivity between breakers or ground-fault protection.
Step 4: Confirm voltage, and AC or DC
Check the rated voltage for your system.
Solar DC warning: for solar DC circuits, confirm in Eaton’s datasheet that the breaker is rated for DC at your string voltage. An AC-only rating is not enough.
Step 5: Decide mounting and accessories
Choose between fixed and plug-in mounting, and decide whether you need a shunt trip, UVR or auxiliary contacts.
Step 6: Consider the environment
Temperature, dust and vibration matter. Solar rooftops and mines are tougher than an indoor distribution room.
MCCB vs MCB: What Is the Difference?
An MCB is a small breaker for final circuits, usually with a fixed trip setting and ratings up to about 125A. An MCCB handles higher currents (up to 630A and beyond in the BZMx and NZM ranges), offers higher breaking capacity and often has adjustable trip settings. Use MCBs for lighting and socket circuits, and MCCBs for feeders, motors, solar combiners and main incomers.
Where to Buy Eaton MCCBs in Coimbatore
Shansen Traders is an authorized channel partner for Eaton electrical products in Coimbatore, and all five MCCBs in this guide are listed on its KovaiGuide page.
- Business: Shansen Traders, Coimbatore
- Address: 216, Addis Street, Coimbatore Press Club Building, Avinashi Road, Coimbatore 641018
- WhatsApp and phone: +91 919442633195
- Email: info@shansen.in
- Listing: Shansen Traders on KovaiGuide
An honest note: specifications in this guide come from supplier product information and can vary by variant. Always confirm the final ratings against the official Eaton datasheet for your exact SKU, and have a qualified electrician install and commission the breaker.
Buyer’s Checklist: Are You Ready to Order an MCCB?
- I know my continuous load current and the breaker rating I need.
- I know the prospective short-circuit current at the installation point.
- I have decided between thermal-magnetic and microprocessor trip units.
- I have checked the voltage rating, and the DC rating if it is for solar.
- I know whether I need fixed or plug-in mounting.
- I know which accessories I need, such as shunt trip, UVR or auxiliary contacts.
- I have noted the exact SKU, for example BZMX2E-3-AX100-S08.
- I have checked the ambient temperature and site conditions.
- I have a qualified electrician lined up for installation and testing.
Get a Quote for Eaton MCCBs
Send the SKU and your required quantity to Shansen Traders on WhatsApp for pricing and availability. You can also open the listing to see all five MCCBs, the full Eaton range and contact details.
Ready to order?
Frequently Asked Questions About Eaton MCCBs
1. What does MCCB stand for?
MCCB stands for Molded Case Circuit Breaker. It is a breaker in an insulated molded housing that protects a circuit against overload and short circuit and can also be used as a manual switch.
2. What is the difference between thermal-magnetic and microprocessor trip units?
A thermal-magnetic trip unit uses a heat-sensitive element for overload and a magnetic coil for short circuit, with limited adjustment. A microprocessor unit (LSI or LSIG) measures current electronically and allows precise adjustment, short-time delay for selectivity and optional ground-fault protection.
3. Can Eaton BZMX MCCBs be used for solar and mining applications?
The Eaton BZMX2E-3-AX80-S08 and BZMX2E-3-AX100-S08 are listed for solar and mining duty, and the BZMX2E-3-AX250-S08 for solar, motor and power distribution protection. For DC solar circuits, always confirm the DC voltage rating in the Eaton datasheet before installing.
4. What is the breaking capacity of the Eaton BZMX2E-3-AX80-S08?
It is 15 kA at 415V AC, and up to 36.5 kA on higher-rated variants. The breaking capacity must be equal to or higher than the prospective short-circuit current at your installation point.
5. What is the difference between the BZMX models and the NZMB1-A63-NA?
Both are Eaton MCCB families. The BZMX models in this guide cover 80A to 250A with 15 kA breaking capacity at 415V AC, and the AX80 and AX100 add plug-in mounting and accessory support. The NZMB1-A63-NA is a compact 63A breaker in the NZM1 frame, rated 25 kAIC at 480VAC, with an adjustable 50A to 63A overload range.
6. What standards do these Eaton MCCBs comply with?
The BZMX models listed here are rated to IEC 60947-2, and the BZMX2E-3-AX80-S08 and AX100-S08 also carry CE marking.
7. Where can I buy Eaton MCCBs in Coimbatore?
Shansen Traders, an authorized Eaton channel partner, lists the BZMX and NZM MCCBs in this guide on KovaiGuide. Open the Shansen Traders listing for contact details and send an enquiry quoting the SKU.
8. How do I get a price quote for an Eaton MCCB?
Message Shansen Traders on WhatsApp at +91 94426-33195 with the SKU and quantity. You can also email info@shansen.in.
Key Takeaways
- An MCCB protects feeders above about 100A against overload and short circuit.
- Match the breaker to load current, fault level, trip unit, voltage and environment.
- BZMX2E-3-AX80-S08 and AX100-S08 are plug-in, accessory-ready breakers for solar and mining duty.
- BZMX2E-3-AX250-S08 offers microprocessor LSI / LSIG trip units for selectivity and ground-fault protection.
- NZMB1-A63-NA is a compact 63A breaker with 25 kAIC breaking capacity.
- For solar DC circuits, always confirm the DC rating in the Eaton datasheet.
- Shansen Traders lists all five Eaton MCCBs on KovaiGuide in Coimbatore.
