MERSEN FUSE NH 3 630A 500V AM M227987

Why Choose the Mersen NH3AM50V630 Motor Protection Fuse-Link?

The Mersen NH3AM50V630 is a heavy-duty DIN NH aM fuse-link engineered to provide reliable short-circuit protection for high-power motor circuits in demanding industrial environments. As part of the trusted Mersen NH aM 500 V AC fuse-link series, it is specifically designed to protect motors, contactors, motor starters and associated switchgear while allowing the high inrush currents generated during motor starting.

Featuring a specialised aM operating characteristic, the NH3AM50V630 rapidly interrupts high fault currents while coordinating with a suitable overload relay or motor protection circuit breaker to provide complete motor circuit protection. Its ceramic body, double indication system and live gripping lugs ensure dependable operation, safe handling and simplified maintenance.

With a rated current of 630 A, a rated voltage of 500 V AC and a standard NH Size 3 construction, the NH3AM50V630 is ideal for protecting large industrial motors, heavy-duty machinery, compressors, conveyors, pumps and power distribution equipment operating in demanding industrial applications.

Key Advantages

• Purpose-designed aM fuse characteristic for motor short-circuit protection.
• 630 A rated current for high-power industrial motor applications.
• 500 V AC rated voltage.
• 120 kA breaking capacity for exceptional fault interruption.
• Allows normal motor starting currents without nuisance operation.
• Double indicator provides rapid visual identification after fuse operation.
• Compatible with standard DIN NH Size 3 fuse bases.

Key Features

• Mersen NH aM 500 V AC fuse-link series.
• DIN NH Size 3.
• 630 A rated current.
• 500 V AC rated voltage.
• Partial-range aM operating characteristic.
• Double fuse operation indicator.
• Live gripping lugs.
• 71.9 mm body width.
• Ceramic insulating body.
• RoHS compliant.

Reliable Short-Circuit Protection for Motor Circuits

The Mersen NH3AM50V630 is designed to interrupt high fault currents before they can damage large motors, motor starters, contactors and associated electrical equipment. Its specialised aM characteristic allows it to withstand normal motor inrush currents while delivering rapid interruption during severe short-circuit faults.

As an aM fuse-link provides partial-range protection, it should always be installed alongside a correctly selected overload relay or motor protection circuit breaker to provide complete protection against sustained overload currents.

Typical Applications

• Large industrial electric motor protection.
• Motor control centres.
• Heavy-duty motor starters.
• Pumps and compressors.
• Conveyor systems.
• Industrial machinery.
• OEM automation equipment.