Arcflash Reduction Maintenance System

Arcflash Reduction Maintenance System

A circuit breaker equipped with an Arcflash Reduction Maintenance System can improve safety by providing a simple and reliable method to reduce fault clearing time. Work locations downstream of a circuit breaker with an Arcflash Reduction Maintenance System unit can have a significantly lower incident energy level.

ARMS technology is based on the realization that when working on energized electrical equipment, a fault that occurs within that gear needs to be cleared as quickly as possible. While this seems obvious, in actual installations, intentional delays are included in upstream devices to ensure selective coordination with downstream devices. This means that if a fault were to occur inside the equipment the downstream breaker might never clear the fault regardless of how much delay is or isn’t programmed in the upstream breaker. Because upstream breaker clearing delay is not necessary, ARMS permits removing this delay while working inside live electrical equipment.

While other Eaton technologies such as ZSI can help, ARMS takes the ZSI solution a step further with a patented technique that provides “faster than instantaneous” clearing times. When ARMS is enabled, the internal circuit breaker digital logic is bypassed by an even faster analog tripping circuit.

VaultGard ARMSVaultGard ARMS
VaultGard Network Protector Arc Reduction Maintenance System (ARMS) Indicating Diagnostic Module (IDM) provides the highest possible arc flash protection for maintenance workers.

MSB switchgear with ARMSMSB switchgear with ARMS
Unique method for reducing arc flash energy at secondary bushings of a unit substation transformer by including two protective devices at the primary.

Molded Case Circuit Breakers with ARMSMolded Case Circuit Breakers with ARMS
Trip units with built in "faster than instantaneous" tripping to reduce arc flash incident energy.

Fixed and Draw-out Magnum Air Circuit Breakers (800 – 6300A) with ARMSFixed and Draw-out Magnum Air Circuit Breakers (800 – 6300A) with ARMS
Eaton's Magnum DS circuit breakers can be provided with either the Digitrip 1150 or the 520MC trip units, each including ARMS functionality.

Fixed and Draw-out Series NRX Air Circuit Breakers (200-1600A) with ARMSFixed and Draw-out Series NRX Air Circuit Breakers (200-1600A) with ARMS
The NRX breaker provides both high interrupting with a short-time rating and can be supplied with either the Digitrip 520M or 1150 trip units with integral ARMS.

Protective Relays with ARMSProtective Relays with ARMS
Eaton's E-Series protective relays include built in ARMs functionality.

FlashGard Motor Control Centers with ARMSFlashGard Motor Control Centers with ARMS
Eaton's innovative "arc-free" MCC design can be supplied with ARMS when the circuit breakers are selected with Digitrip 310+ trip units.

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