Emergency distribution boxes
- End-of-line transfer: dual sources transfer at the load end — zero-second pickup on loss of one source
- Forced-shutdown interface: non-fire power shutdown signal (dry contact) wired in and executed
- Circuit division: emergency lighting, exit signage and critical backup loads on separate circuits, no cross-interference
- EPS interface: connection and charge-monitoring circuits reserved for emergency power supply (EPS / battery bank)
- Enclosure: IP30 indoor / IP54 semi-outdoor, with clear "Emergency" labeling
Specifications
The table below covers 80% of factory distribution room cases. Anything outside it we can still build — those are engineered items, quoted separately, with an indicative price the same day.
| Enclosure type | Indoor surface / flush mount, wall-mounted as standard |
|---|---|
| Standard dimensions (W×H×D) | 500×650×200 to 700×900×250 mm, custom sizes available |
| Enclosure construction | 1.5 mm cold-rolled steel, electrostatic powder coating, red "Emergency" marking on the door |
| IP rating | IP30 (indoor) / IP54 (semi-outdoor, parking garage) |
| Indicator panel | Three indicator groups — mains / backup / emergency operation — plus test button |
| Cable entry | Dual bottom cable entry; outgoing circuits individually labeled |
| Rated voltage | AC 220/380V, 50 Hz |
|---|---|
| Transfer at the point of use | PC-class low-current ATS or contactor interlock transfer (by load class) |
| Circuit division | Emergency lighting / exit signage / backup critical loads on separate circuits, each with protection |
| Forced switch-off interface | Fire alarm forced switch-off via dry contact; shunt trip cuts non-fire circuits |
| EPS connection | EPS / battery bank input circuit with charging monitoring (per system design) |
| Test function | Panel test button simulates loss of primary supply to verify transfer and emergency engagement |
| Division of labor | Project-specific fire acceptance requirements confirmed per project; no claim of specialized certification |
| Component brands | Schneider / ABB / Chint, self-procured and shipped to factory accepted |
| Emergency lighting end-of-line type | Dual-circuit end-of-line transfer + dedicated emergency lighting circuit; common in garages and corridors |
|---|---|
| EPS integrated type | EPS and distribution in one enclosure (small capacity); battery monitoring and transfer integrated |
| Forced switch-off execution type | Fire signal cuts non-fire power; emergency and fire loads remain energized |
| Critical load backup type | End-of-line dual supply for critical loads such as server rooms and monitoring |
| Retrofit add-on type | Transfer and forced switch-off added to existing boxes (subject to site assessment) |
| Assembly standard | GB/T 7251.1 / IEC 61439-1 |
|---|---|
| Transfer verification | Simulate loss of primary supply on each unit to verify end-of-line transfer sequence |
| Forced switch-off verification | Simulate forced switch-off signal on each unit to verify non-fire circuit cut-off |
| Routine tests (every unit) | Insulation resistance, dielectric withstand, transfer and forced switch-off powered logic |
| Documents with shipment | System diagram, transfer and forced switch-off logic description, terminal schedule, BOM, test report |
Five steps to specify your run
A configuration summary is generated as you go. It travels with your inquiry, saving a round of confirmation.
Build details
Systems have been in service for decades, and the failure points are always the same few: poor busbar contact, water ingress at the door seal, high temperature rise in the correction cabinet, and mis-phased outgoing feeders. The six hard rules below are written for exactly these points — every cabinet can be traced to them.
No power loss on the last meter
Transfer happens right at the load: if any upstream segment loses power, the cabinet immediately switches to the backup supply, keeping the emergency lighting supply radius as short as possible — that is the point of point-of-use transfer, and it is not done in the distribution room.
What should stop stops, what should stay lit stays lit
The forced shutdown signal trips non-fire circuits via shunt release, while emergency circuits remain physically independent and unaffected; forced shutdown and transfer logic are verified under power on every unit.
Recognizable as emergency at a glance
Red "Emergency Distribution" marking on the door plus three status lights — anyone can find it and read it in an emergency.
Monthly checks without disruption
The panel test button simulates a power loss so transfer can be verified without actually cutting power; include it in monthly inspections — if the button does nothing when pressed, it is time for service.
Dedicated color for emergency circuits
Emergency circuit conductors use a dedicated color (white, or per local practice) so they are visually distinct from normal circuits at a glance — no risk of miswiring during future modifications.
Acceptance requirements written into the agreement
For projects subject to fire acceptance inspection, every local requirement is written line by line into the technical agreement before work starts — what we supply, what the project side coordinates, in writing.
Photos & enclosure construction
Below are photos taken in our own shop — from the complete unit down to the internal busbars and secondary wiring. Every build detail can be checked item by item.
Image key: 01–05 are shop photos (the numbers match the shot list). The line drawing shows the front elevation of the enclosure; dimensions match the specification table above.
Where these cabinets go
These are the routine applications — we can talk scheme and configuration directly. For the industry view, see the industry pages.
Underground parking garage
End-of-line transfer for emergency lighting and exit signage, with forced trip provision.
Commercial and office buildings
Emergency lighting in corridors and stairwells, fire forced trip execution.
Factory evacuation routes
Workshop safety lighting and emergency exit signage.
Server rooms and control rooms
End-of-line dual power supply for critical loads.
Hospital and school corridors
Emergency lighting and backup circuits (acceptance requirements confirmed per project).
Older Building Retrofit
Retrofit end-of-line transfer and forced trip, implemented based on site assessment.
Commercial terms
Specification dated September 2026; quotations follow this.
| Drawings & design | Free |
| MOQ | 1 unit (5 or more recommended for production) |
| Production lead time | 15-25 days after drawing approval |
| on-time delivery | 98% |
| Warranty | 12 months |
| Loading port | Ningbo / Shanghai, China |
| Component brands | Schneider / ABB / Siemens / Chint |
| Factory visit & dispatch confirmation | Factory visits welcome; finished-cabinet photos and video before dispatch |
| Capacity | 5,800+ units / year |
Documents for your engineering team
Selection manual, outline dimensions and RFQ checklist — for the customer's electrical engineer. All three documents are being organized by product line; download links go live once complete.
Six questions procurement and electrical engineers ask most
What is the difference between an emergency distribution box and a dual power supply transfer box?
A dual power supply transfer box is a general-purpose enclosure type; an emergency distribution box is its reinforced version for emergency scenarios: end-of-line transfer + circuits divided by emergency load + fire forced trip interface + clear marking. The core difference is in circuit division and forced trip logic — the enclosure itself is secondary.
Are you responsible for fire acceptance inspection?
Special access requirements and local acceptance requirements for fire products are confirmed per project when defining the supply scope: we deliver the electrical functions — transfer, forced trip, circuits — while the special documentation and certifications required for acceptance are coordinated by the project side or agreed between both parties in the technical agreement. No overpromising, no ambiguity — verify before ordering.
Should an EPS be supplied together?
For small capacities (evacuation lighting level), the EPS and distribution can share one enclosure with integrated battery monitoring; for larger capacities, we recommend a separate EPS cabinet, and we provide the connection circuits. The EPS unit itself is selected by backup duration (30/60/90 min) — send us the load list and we will size it together.
When does the forced trip activate?
After a confirmed fire, the fire system outputs a forced trip signal (dry contact) to cut non-fire power supplied by this box (normal lighting, air conditioning, etc.), while emergency and fire loads remain powered. The signal source and trip scope are defined during system design; the box executes and provides feedback.
Are emergency circuits energized under normal conditions?
Yes. Emergency lighting is normally powered from the main supply (luminaires with batteries self-charge), and only transfers when the main supply is lost. That means the emergency box must be reliable 7×24, and components are selected for continuous operation.
Can it be retrofitted into an old building?
Yes, provided there are two power sources or an EPS is feasible. We start with a site survey: upstream supply, cable routing, installation location — then issue a retrofit plan after assessment. For old buildings with only one source, the second source (or luminaire-level emergency lights) must be resolved first before discussing end-of-line transfer.
Other cabinet types in the same main circuit
Related products use color-block placeholders for now (product photos not yet complete; they will be replaced together). Internal links will be filled in once live URLs are confirmed.
Send us the emergency load list and we will group circuits accordingly
Send us your emergency load list and acceptance requirements — free end-of-line transfer and circuit design · quote within 24 hours. Direct from the source factory, MOQ 1 unit, 15–25 day delivery, 1-year warranty.
ISO 9001:2015 · CE(LVD+EMC) · CQC · IP65
When you write, include: single-line diagram or primary scheme, switch room layout, load list, and component brand requirements. You do not need complete drawings — capacity and cabinet type are enough to start.