Overview
The Ferraz ST10-M-81-224 is an industrial-grade single-pole fuse holder rated for 32A at 660VAC. Built into the ST10 series, this fuse block is designed for electrical circuit protection in industrial automation, control panels, and power distribution systems. The unit includes a blown fuse indicator to quickly alert operators and maintenance personnel to a fault condition without requiring direct visual inspection of the fuse element.
Key Features
- Single-pole configuration for simple, space-efficient installation
- 32A rated current capacity at 660VAC operating voltage
- Blown fuse indicator for visual status feedback and faster troubleshooting
- Rated for 690V maximum AC voltage with 48–62 Hz operation
- Designed for screw-terminal connection with recommended torque specifications
- Compliant with CEI 947.3 and NF EN 60947.3 industrial standards
Technical Specifications
- Rated Current: 32A
- Voltage: 660VAC nominal / 690VAC maximum
- Poles: 1 (single-pole)
- Frequency: 48–62 Hz
- Impulse Withstand: 6 kV
- Fuse Size: 10 × 38 mm cartridge
- Terminal Type: Screw connection (PZ 2 or flat 5.5 × 1 mm screwdriver)
- Tightening Torque: Max 4.5 Nm (45 lbs·in)
- Mounting: DIN rail or chassis mount compatible
- Weight: Approximately 70 grams
- Indicator: Mechanical blown fuse indicator
- Standards: CEI 947.3, NF EN 60947.3
Typical Applications
- Industrial motor control circuits and variable frequency drive (VFD) protection
- PLC and HMI power distribution panels
- Backup power systems and uninterruptible power supply (UPS) circuits
- Machine automation and assembly line protection
- Switchgear and electrical distribution equipment
- Power quality and fault current limitation in three-phase systems
Compatibility & Replacements
Compatible With
- Ferraz Shawmut 10 × 38 mm gG and aM fuse elements rated 500V–690V
- DIN rail mounted control panels and electrical enclosures
- Industrial switchgear and fused disconnect applications
- Power distribution systems operating at 48–62 Hz, 50/60 Hz standard
- CE-marked electrical equipment requiring IEC 60947.3 compliance
Replaces / Drop-In Replacement For
- Ferraz M-81-224 (equivalent model designation)
- Other ST10 series single-pole fuse blocks rated 32A, 660VAC
Works With
- Ferraz FS-fuse gG and aM cartridge fuse ranges (10 × 38 mm)
- Industrial control systems and panel-mounted electrical protection circuits
- Mechanical indicator microswitches for remote alarm integration (requires striker-equipped fuses)
- Standard industrial fasteners and DIN-compliant mounting hardware
