Overview
The Siemens JN322 /A is a general-duty safety disconnect switch designed for low-voltage electrical installations. Rated at 60 amperes and 240 volts, this fusible disconnect switch operates in a Type 1 (NEMA 1) indoor enclosure and provides manual isolation and switching capability for branch circuits, load centers, and machinery protection. The visible-blade design ensures operators can confirm the switch position at a glance, and the 100 kA interrupting rating handles significant fault currents without damage.
Key Features
- Fusible Design: Accepts Class R fuses for coordinated circuit protection and selective fault isolation
- Visible Blade: Operator can visually confirm ON/OFF position for safety and compliance
- Quick-Make/Quick-Break Mechanism: Ensures positive and reliable switching action under load
- Type 1 Enclosure (NEMA 1): Indoor wall-mount installation, suitable for dry indoor locations
- 100 kA Interrupting Rating: Safely handles fault currents up to 100,000 amps at 240V without damage
- Arc Chutes: Integrated arc suppression dissipates switching arcs for extended component life
Technical Specifications
- Ampere Rating: 60 A
- Voltage Rating: 240 VAC
- Poles: 2-pole (1 phase)
- Type: Fusible (Class R)
- Enclosure Rating: Type 1 / NEMA 1 (Indoor)
- Interrupting Rating: 100 kA @ 240V
- Mounting: Wall-mount panel
- Mechanism: Visible blade with quick-break contact
- Suitable For: Dry indoor locations only
- Certifications: Meets UL 98 and industry safety standards
Typical Applications
The Siemens JN322 /A disconnect switch is commonly used for:
- Branch circuit isolation in residential and light commercial electrical panels
- Motor circuit disconnect and protection in machine control systems
- Transformer secondary disconnect switches and load isolation
- General-purpose load switching in low-voltage distribution systems
- Maintenance isolation points for equipment shutdown and lockout/tagout (LOTO) procedures
- Machinery protection in manufacturing and industrial facilities
Compatibility & Replacements
Compatible With
- Low-voltage branch circuits and load centers rated 240V AC and below
- Class R fuse systems (15A–100A fuse ratings)
- Standard electrical panel enclosures (Type 1 / NEMA 1)
- Manual operator control systems
- Dry indoor electrical environments (residential, commercial, light industrial)
Replaces / Drop-In Replacement For
The JN322 /A is part of Siemens’ JN-series disconnect switches. When sourcing a direct replacement, verify that the candidate unit matches these exact specifications: 60A rating, 240V voltage, 2-pole configuration, fusible type with Class R fuse acceptance, Type 1/NEMA 1 indoor enclosure, and 100 kA interrupting rating. Other Siemens models in similar categories (such as the SN322 and GNF series) may have different ratings or non-fusible designs and should not be substituted without engineering verification.
Works With
- Class R fuses (coordinated for selective fault isolation)
- Standard electrical panel hardware and bus systems
- Manual lockout/tagout (LOTO) procedures and equipment shutdown systems
- Low-voltage branch circuit protection schemes (up to 100 kA available fault current at 240V)
