Siemens 3NC1016 SITOR Cylindrical Fuse Link

Technical Overview

10x38 mm ultra-fast semiconductor protection fuse link. Rated 16A, 600V AC / 700V DC. Operating class aR. For protective isolation in power electronic systems.

Key Features

Ultra-fast acting operational class (aR) ensures swift response to short-circuits, safeguarding delicate power semiconductors.
Compact 10 x 38 mm cylindrical package ideal for space-constrained installations in standard industrial enclosures.
Dual-voltage rated for versatile application across 600 V AC and 700 V DC systems (UL-compliant).
Low power dissipation of 3.5 W minimizes thermal stress and heat generation within switchboard designs.
Broad international compliance, certified by UL, CSA, EAC, CE, and GOST, enabling global deployment.
Engineered for high capability under alternating load, assuring operational longevity and reliability.

Technical Specification Matrix

Parameter	Value
Operating Class	aR (ultra-fast acting semiconductor protection)
Size	10 x 38 mm
Rated Operational Current	16 A
Rated Voltage AC	600 V
Rated Voltage DC	700 V
Power Loss (Hot Operating State per Pole)	4.0 W
Dissipation Power Loss	3.5 W
Product Component Striker	No
Mounting Position	Any, preferably vertical
Standards and Approvals	CSA, UL, EAC, CE, EG-KONF, GOST
Physical Weight (kg)	0.01
Dimensions L x W x H (cm)	3.8 x 1 x 1

Industrial Applications

1. Protection of Variable Frequency Drive (VFD) Input Rectifiers

Installed on the input lines of low-power Variable Frequency Drives to protect front-end rectifier diodes or thyristors from line-side transient overcurrents.

Problem Solved

Standard line protection fuses are too slow to clear semiconductor overcurrent faults, leading to blown diodes and costly drive failure. The ultra-fast aR characteristics of the 3NC1016 isolate the fault within milliseconds, keeping the transient energy well below the SCR junction thermal limit.

VFD Rectifier ProtectionaR Semiconductor FuseOvercurrent ClearingTransient IsolationThyristor Safety

2. Uninterruptible Power Supply (UPS) DC Link Protection

Utilized in high-reliability double-conversion UPS systems to secure DC bus connections, batteries, and downstream inverter switches.

Problem Solved

Avoids catastrophic cascade damage when inverter shoot-through faults occur. Rated for 700 V DC, this fuse link effectively interrupts severe DC faults and prevents energy dump from the capacitive bus into failing IGBT components.

UPS DC Link Protection700V DC ClearingIGBT SafeguardInverter Branch IsolationCylindrical Cartridge Fuse

3. Industrial Motor Soft-Starter Solid State Protection

Connected in series with each phase of three-phase electronic soft-starters to protect the active thyristor (SCR) power block from motor-side failures.

Problem Solved

During motor winding insulation breakdown, massive short-circuit currents will rapidly destroy SCR junctions. The 3NC1016's low clearing I²t values ensure that the fault is isolated instantly, limiting the damage to the load side and shielding the soft-starter power module.

Soft-Starter ProtectionSCR Thermal LimitsPhase ProtectionLow clearing I2tRapid Fault Isolation