Power isolation is rarely “dramatic”—until the moment it matters. The SH7-125 DIN rail switch disconnector isolator is built for those everyday decisions that protect people, tools, and uptime: one deliberate turn, a firm mechanical click, and the circuit is separated in a way technicians can trust.

In a busy panel, clarity beats guesswork. The position indication gives a quick visual confirmation of ON/OFF state, reducing the hesitation that slows maintenance and increases risk. The handle has an anti-skid texture—a small detail that changes how the product feels in real use: stable under the fingers, controlled, and predictable, even when the enclosure is warm or the operator is wearing gloves.

This isolator is designed to support clean, repeatable procedures. The OFF-locking function helps prevent accidental re-energizing when equipment is being serviced. Combined with a compact DIN-rail form factor, it fits naturally into distribution boards, control cabinets, and service enclosures where space is precious and access is limited.

Whether you’re isolating a branch circuit before replacing a motor accessory, segmenting a renewable energy array for inspection, or creating a clear emergency isolation point in a public facility, SH7-125 is made to turn “I think it’s off” into “I know it’s isolated.”

Technical data

Overall and mounting dimensions(mm)

Features & Highlights

• Visible isolation confidence

• Clear position indication helps reduce operational errors and miscommunication.

• Supports safer workflows during inspection, troubleshooting, and part replacement.

• Designed for real-hand operation

• Anti-skid handle offers a steady grip and controlled switching feel.

• Smooth, decisive actuation reduces repeated toggling and wear.

• Safety-focused mechanical design

• Lockable OFF position helps align with maintenance lockout routines.

• Suitable for creating a defined isolation point in cabinets and distribution boards.

• Built for harsh electrical environments

• Flame-retardant, high-temperature resistant, impact-resistant housing helps maintain integrity in crowded panels.

• Reliable performance under common indoor industrial temperature ranges.

• Flexible configuration

• 1P/2P/3P/4P versions support single-phase and three-phase isolation needs.

• Compatible with common accessories such as padlock kits and auxiliary switches (where applicable).

• Standards alignment

• Designed according to IEC 600947-3 requirements for switch disconnectors/isolators.

  
  

Applications

• Industrial control panels and distribution boards

• Provides a clear, dedicated disconnection point for servicing pumps, fans, small machines, and control power circuits.

• Helps reduce downtime by making isolation faster and more verifiable.

• Renewable energy and auxiliary power segments

• Useful for isolating sections of solar or wind-related electrical subsystems during inspection or replacement.

• A “visible break” style of isolation supports safer field work where multiple teams may be present.

• Commercial buildings and public facilities

• Suitable for isolating lighting circuits, HVAC auxiliary lines, and service circuits during scheduled maintenance.

• Helps simplify facility safety procedures by creating a single, obvious switching point.

• Marine and coastal environments (enclosure-dependent)

• When installed in appropriate enclosures, the isolator’s robust build supports stable operation in humid, salty atmospheres.

• Helps crews isolate loads during routine checks where reliability is non-negotiable.

  
  

Materials & Safety Design

• Heat and flame-retardant housing helps the device keep its shape and protective function when installed near warm conductors or in crowded distribution boards. In practice, this means fewer worries about deformation, loose fits, or brittle parts after long service intervals.

• Impact-resistant structure is valuable during installation and retrofits. Panels are tight, tools slip, covers bump—this design is intended to tolerate real-site handling rather than only ideal lab conditions.

• Clear state communication is a safety feature, not decoration. When teams can see ON/OFF status quickly, they reduce unnecessary re-checks, shorten isolation confirmation time, and lower the chance of switching the wrong device.

• Lockable OFF readiness supports stricter maintenance routines. It’s especially helpful when multiple workers rotate through the same equipment: the product design supports a “hands-off until released” habit.

  
  

Installation & Wiring Guidance

• Mounting

• Designed for embedded vertical standard rail mounting (DIN rail style).

• Keep adequate clearance for handle operation and cable bending radius.

• Wiring

• Use clamp connections with screw tightening to 2.5 N·m torque.

• Match conductor size to terminal capability: up to 50 mm² (AWG 18–1/0).

• Commissioning checklist

• Verify pole configuration (1P–4P) matches the circuit isolation requirement.

• Confirm ON/OFF indication aligns with actual circuit state after wiring.

• Perform insulation/continuity checks according to site procedures before energizing.

• Operating conditions

• Ambient: -25 to +60°C (daily average ≤ 35°C)

• Altitude: ≤ 2000 m

• Pollution degree: 2 (typical indoor distribution environments)

  
  

Selection Guide

• Choose poles

• 1P: single live conductor isolation (application-dependent)

• 2P: single-phase with neutral isolation needs

• 3P: three-phase isolation

• 4P: three-phase + neutral isolation for clearer maintenance boundaries

• Choose rated current (Ie)

• Select 20–125A based on continuous load and installation conditions.

• Leave engineering margin where temperature rise or enclosure density is high.

• Choose by duty

• Utilization category AC-22A suits mixed resistive/inductive loads in distribution and general switching, helping reduce premature wear in typical service work.

  
  

Quality Control & Reliability

• Lifecycle-focused design targets

• Mechanical life: 8500 operations supports repeated service isolation without “loose” feel developing early.

• Electrical life: 1500 operations supports real switching events within rated conditions.

• Electrical strength parameters that matter

• Uimp 4kV and Ui 500V provide headroom against transient stress and insulation demands in low-voltage systems.

• Withstand and making parameters help reduce failure risk during abnormal conditions (when correctly coordinated within the protection scheme).

• Consistency in installation

• Defined torque requirement (2.5 N·m) and terminal capacity make the product easier to install consistently across teams, reducing heat points caused by under/over-tightening.

  
  

Packaging, Delivery & Customization Options

• Packaging focus

• Protective packing designed to keep the handle, terminals, and housing edges from scuffing during transit so the unit arrives clean and installation-ready.

• Documentation support

• Provide product identification for ordering and configuration confirmation (model, poles, current rating).

• Customization possibilities (availability-dependent)

• Pole configuration and rated current options within the series range.

• Accessory compatibility planning (e.g., padlock kit, auxiliary switch) for site procedures and signaling needs.

• Delivery expectations

• For project schedules, share required variants (1P–4P and current rating) upfront to align production and packing lists accurately.

  
  

Why Choose Us

• Product-first engineering mindset

• The SH7-125 series is built around practical isolation: clear indication, lockable OFF readiness, and a robust feel during operation—details that reduce avoidable site risk.

• Parameter transparency

• Clear technical data (Ue, Ie range, Uimp, Ui, lifecycle, wiring limits) helps engineers specify with confidence and reduces back-and-forth during approval.

• Support for real installations

• DIN-rail mounting, defined torque guidance, and broad terminal capability simplify standardization across panels and projects.

• Manufacturing foundation

• Backed by an established manufacturer (founded 2003) with stable production capability and export communication channels for specification confirmation and after-sales coordination.

  
  

FAQ

Q1: Is this a circuit breaker or an isolator?
A: SH7-125 is an isolating switch / switch disconnector designed to provide a clear disconnection point. It is used for isolation and safe maintenance procedures, and should be coordinated with appropriate protective devices in the system design.

Q2: What ratings are available in this series?
A: The rated current options are 20, 32, 40, 63, 80, 100, 125A, with 230/400V rated operational voltage and 50/60Hz frequency.

Q3: Can I use it for single-phase and three-phase systems?
A: Yes. The series supports 1P, 2P, 3P, and 4P configurations, enabling common single-phase and three-phase isolation arrangements.

Q4: What makes it safer during maintenance?
A: A combination of clear ON/OFF position indication and lockable OFF capability helps prevent accidental energizing and reduces ambiguity when multiple people work on the same equipment.

Q5: How should I mount and wire it?
A: It is designed for embedded vertical standard rail mounting. Wiring uses clamp screw terminals with a recommended tightening torque of 2.5 N·m, supporting up to 50 mm² (AWG 18–1/0).

Q6: What environmental limits should I observe?
A: Operate within -25 to +60°C, daily average ≤ 35°C, and ≤ 2000 m altitude. The product is IP20, so choose a suitable enclosure for dust/contact protection based on the installation site.