HEYI Electric’s SDH Window-type CT : a universal player for European and American projects

Two frequency options :

50Hz /60Hz for Europe and 60Hz for North America. One set of assembly design is universally applicable worldwide , so there is no need to distinguish two sets of product numbers for cross-border and cross- regional projects .

The large window is convenient for core threading :

the window is relatively large, suitable for direct threading of busbars/thick cables. The renovation project does not require major wiring removal, minimizing power outage time.

Wide range coverage to meet user needs :

There are corresponding models for primary currents from 50/5A to 10000/5A, and common 200/5A, 400/5A, 800/5A, 1500/5A, 3000/5A… are fully covered .

Accuracy: 0.5 level/1.0 level optional , some models can also reach 0.2 level , which can meet the needs of metering-level monitoring, energy consumption statistics and protection.

Installation-friendly:

The terminals are clearly distinguished (S1 white, S2 black), fixed with screws, and the output/connection lines are clear at a glance; the shell is flame retardant, durable and reliable.

Compatible with mainstream instruments:

secondary current output 1A or 5A, connection to energy meters, protection devices, and data collection units are all standard and smooth.

It will be more convenient to put it in the project

Distribution cabinets/switch stations ( IEC /NEMA styles are common):

used for MCC, PCC, and building power distribution, with CTs directly mounted on busbars; small-size models are suitable for drawer cabinets with dense circuits.

Data center:

Branch monitoring + energy consumption breakdown, multiple circuits at a time, small window models such as SDH-40/50 are suitable.

Photovoltaic/energy storage/microgrid:

The current on the inverter side/grid connection point is large, and the large-window models such as SDH-80/100/120/150/180/220 can withstand high primary current.

Industrial and commercial charging:

The low-voltage side of the charging pile is equipped with a meter for measurement/operation and maintenance, with a 0.5-level accuracy and a measurable range of 5 to 120% In, easily covering peak/light loads.

Key indicators of Heyi SDH Window-type CT

Frequency: 50/60Hz

System rated voltage: ≤ 0.72 kV AC (low voltage system)

Insulation withstand voltage: 3.0 kV / 1 min

Insulation resistance: DC 500V ≥100 MΩ

Measuring range: 5%In～120%In

Secondary: 1A or 5A

Load: 2.5～30 VA optional according to model/primary current

Working environment: –25℃～+75℃, humidity ≤85%

Shell/Frame/Core: PC (UL94-V0)/PBT/Silicon Steel. The above parameters are from SDH series technical data.

SDH Selection Guide

First determine the primary current:

select the closest rated ratio based on the maximum current of the loop (for example, for a 630A loop, choose 600/5A or 750/5A, depending on the specific requirements for redundancy and accuracy ).

Consider the window and installation position:

if the busbar is thick/multiple rows are in parallel, choose large windows such as SDH-80/100/120/150/180/220 Window-type CT; if the cable outlet is compact, use SDH-40/50/60 Window-type CT .

Matching the secondary and load:

Does your meter/protection device need 1A or 5A? Calculate the VA based on the cable length + meter power consumption, and it should fall within the range of 2.5 to 30VA.

Tips: S1 (white) is connected to the power supply side, and S2 (black) is connected to the load side.

The secondary circuit must be reliably short-circuited or connected to the load before power is supplied to ensure safety and accuracy.

Common problems in European and American projects: how our SDH Window-type CT solves them

“Renovation of old cabinets, small space” → Choose a large window to pass the busbar, which reduces the need for wiring; or use a small window model for flexible cable loops.

“The peak-to-valley difference is large, what about the light load accuracy?” → 0.5 level/1.0 level, and 5%In can also be measured stably, and sub-item measurement is more accurate.

“Materials for cross-regional projects must be unified” → 50/60Hz universal, both 1A and 5A secondary, reducing engineering changes due to regional differences.

We can also provide OEM customization

If your project has special requirements (unconventional windows/fixing methods, customized ratios, wire end connectors, laser coding, wire harness length, special load/precision, etc.), we can provide OEM support according to the drawings and lists, and ensure direct installation on site.

Typical matching suggestions

Energy consumption monitoring system:

SDH-40 or SDH-50 Window-type CT  + multi-circuit energy meter (5A secondary), branch-level energy consumption sub-items

Backup automatic switching/protection circuit:

SDH-60/80 + protection device (1A secondary), taking into account both accuracy and response

High-current main incoming line:

SDH-120/150/180/220 (1000-10000/5A) Window-type CT + energy meter/collection gateway, suitable for data center backbones and energy storage grid connection points.
All combinations are subject to on-site current and installation space. Please refer to the data sheet for details.

Compay：HEYI Electrical Co., Ltd.

Brand: HEYI/ASCT

Contact: Bethy

E-mail: heyi@heyiele.com             

Tel: 86-13968747975

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