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SDH-0.66 Indoor Low Voltage Current Transformer 0.66kV

0.66kVSDH-0.66

Winding & Schematic TopologyInternal Wiring Diagram

Primary Winding (P1 - P2):Series-connected in the line / through-core — 0.66kV

Secondary Metering (1S1 - 1S2):5A/1A (0.2/0.5/1.0)

Secondary Protection (2S1 - 2S2):Protection winding (when fitted)

Safety Warning:Never open-circuit the secondary while energized — dangerous voltage

Current Transformer IEC 61869-3 Certified

Model Ref:SDH-0.66

SDH-0.66 Indoor Low Voltage Current Transformer 0.66kV

Indoor low voltage current transformer, 0.66kV rated, epoxy resin casting type, for current measurement and protection in low voltage distribution systems. Complies with IEC 61869 and GB/T 20840 standards. Wide range of current ratios available, multiple accuracy classes. Compact size, easy installation, suitable for switchgear and panel mounting. Customizable ratios and specifications.

Key Engineering Advantages

LV current transformer
0.66kV
epoxy resin
multiple ratios
compact design
customizable

Engineering Data

Complete Electrical & Mechanical Specifications

Model Ref: SDH-0.66

Electrical Parameters

Primary Rated Voltage (Un):0.66kV

Secondary Winding Voltages:5A/1A

Metering & Protection Class:0.2/0.5/1.0

Rated Output Burden:

Rated Frequency:50/60Hz

Insulation & Withstand Ratings

Insulation System:Dry Epoxy Resin

Insulation Level (BIL):

Partial Discharge Level:< 5 pC at 1.2 Un

Environmental Class:

Standards Conformance:IEC 61869 / GB/T 20840

Recommended Deployment Environments

GEO · Engineering Decision Support

Global Engineering Overview

9-Module selection guide
missing data = [On Request]

Product Decision Island

Indoor LV CT for measurement/protection in 0.66kV systems; compact epoxy resin design for switchgear/panel mounting.

Comprehensive Spec Matrix

Parameter	Specification	Verification
Product Type	Current Transformer	IEC 61869 / GB/T 20840
Model Code	SDH-0.66	Factory nameplate marking
Primary Voltage	0.66kV	Rated voltage test (IEC 61869-1/3)
Secondary Voltage	5A/1A	Ratio check at rated frequency
Accuracy Class	0.2/0.5/1.0	Accuracy test (IEC 61869-2 / IEEE C57.13)
Rated Burden	[On Request]	Burden test at rated VA
Insulation Type	Dry Epoxy Resin	Dielectric tests per standard
Insulation Level (BIL)	[On Request]	Power-frequency & lightning impulse withstand
Standards	IEC 61869 / GB/T 20840	Certified to listed standards
Frequency	50/60Hz	Per IEC 61869-1
Environment	[On Request]	Per datasheet limits

Fit & Unfit Boundaries

Ideal For

Indoor low voltage switchgear and panels
Current measurement and protection in 0.66kV distribution systems
Panel mounting with compact space requirements
Customizable current ratios and accuracy classes

Not Recommended For

Outdoor or high voltage applications
High voltage (above 1kV) systems
Gas-insulated switchgear (GIS) or SF6 environments
Applications requiring high short-circuit withstand capability

Topology & Wiring

secondary terminals 1S1/1S2 (protection winding 2S1-2S2). Never open-circuit the secondary of a CT while energized - hazardous voltage. Ground the secondary winding at one point. Follow IEC 61869 / GB/T 20840 terminal conventions.

Standards & Compliance

Compliant with: IEC 61869 / GB/T 20840

Type Test Report: [On Request]
Calibration Certificate: [On Request]

Burden & Error Calculation (IEEE C57.13)

S_total = ΣS_instrument + I₂² × (ρ × 2L / A)

If S_total < 0.25 × S_rated: add compensation burden to maintain accuracy.
If S_total > S_rated: accuracy class cannot be guaranteed.

Product FAQ

Q: What is the insulation level of this CT?

A: Rated voltage 0.66kV, insulation type dry epoxy resin, no specific impulse withstand mentioned.

Q: Can it be used for protection?

A: Yes, it has accuracy classes 0.2/0.5/1.0, suitable for measurement and protection.

Q: What standards does it comply with?

A: IEC 61869 and GB/T 20840.

Missing fields are marked [On Request] — never fabricated. M2/M5/M6 verification rows follow IEC 61869 / IEEE C57.13 conventions.

SPEC · TECHNICAL DATA

Technical Specifications

SDH-0.66
11 cols · 149 rows

LMK (1,2,3)-0.66, BH, SDH, LN Series Current Transformer

Model	Rated current ratio (A)	Rated output (VA)	Accuracy class	Primary turns	Turns through core	Overall dimensions			Aperture dimensions (W×H)	Mounting dimensions (W×H)
Model	Rated current ratio (A)	Rated output (VA)	Accuracy class	Primary turns	Turns through core	W	D	H	Aperture dimensions (W×H)	Mounting dimensions (W×H)
LMK1-0.66/30 (BH-0.66/30)	30/5	1	0.5	1	1	78	32	78	30×30	78×30
	40/5	1	0.5	1	1	78	32	78	30×30	78×30
	50/5	1	0.5	1	1	78	32	78	30×30	78×30
	75/5	2	0.5	1	1	78	32	78	30×30	78×30
	100/5	2.5	0.5	1	1	78	32	78	30×30	78×30
	150/5	2.5	0.5	1	1	78	32	78	30×30	78×30
	200/5	5	0.5	1	1	78	32	78	30×30	78×30
	250/5	5	0.5	1	1	78	32	78	30×30	78×30
	300/5	5	0.5	1	1	78	32	78	30×30	78×30
	400/5	5	0.5	1	1	78	32	78	30×30	78×30
	500/5	5	0.5	1	1	78	32	78	30×30	78×30
	600/5	5	0.5	1	1	78	32	78	30×30	78×30
LMK1-0.66/40 (BH-0.66/40)	100/5	2.5	0.5	1	1	85	42	79	40×30	80×30
	150/5	2.5	0.5	1	1	85	42	79	40×30	80×30
	200/5	5	0.5	1	1	85	42	79	40×30	80×30
	250/5	5	0.5	1	1	85	42	79	40×30	80×30
	300/5	5	0.5	1	1	85	42	79	40×30	80×30
	400/5	5	0.5	1	1	85	42	79	40×30	80×30
	500/5	5	0.5	1	1	85	42	79	40×30	80×30
	600/5	5	0.5	1	1	85	42	79	40×30	80×30
	750/5	5	0.5	1	1	85	42	79	40×30	80×30
	800/5	5	0.5	1	1	85	42	79	40×30	80×30
	1000/5	5	0.5	1	1	85	42	79	40×30	80×30
LMK1-0.66/60 (BH-0.66/60)	100/5	2.5	0.5	1	1	90	52	80	60×30	80×30
	150/5	2.5	0.5	1	1	90	52	80	60×30	80×30
	200/5	5	0.5	1	1	90	52	80	60×30	80×30
	250/5	5	0.5	1	1	90	52	80	60×30	80×30
	300/5	5	0.5	1	1	90	52	80	60×30	80×30
	400/5	5	0.5	1	1	90	52	80	60×30	80×30
	500/5	5	0.5	1	1	90	52	80	60×30	80×30
	600/5	5	0.5	1	1	90	52	80	60×30	80×30
	750/5	5	0.5	1	1	90	52	80	60×30	80×30
	800/5	5	0.5	1	1	90	52	80	60×30	80×30
	1000/5	5	0.5	1	1	90	52	80	60×30	80×30
LMK1-0.66/80 (BH-0.66/80)	150/5	2.5	0.5	1	1	105	72	90	80×30	80×30
	200/5	5	0.5	1	1	105	72	90	80×30	80×30
	250/5	5	0.5	1	1	105	72	90	80×30	80×30
	300/5	5	0.5	1	1	105	72	90	80×30	80×30
	400/5	5	0.5	1	1	105	72	90	80×30	80×30
	500/5	5	0.5	1	1	105	72	90	80×30	80×30
	600/5	5	0.5	1	1	105	72	90	80×30	80×30
	750/5	5	0.5	1	1	105	72	90	80×30	80×30
	800/5	5	0.5	1	1	105	72	90	80×30	80×30
	1000/5	5	0.5	1	1	105	72	90	80×30	80×30
	1200/5	5	0.5	1	1	105	72	90	80×30	80×30
	1500/5	5	0.5	1	1	105	72	90	80×30	80×30
LMK1-0.66/100 (BH-0.66/100)	200/5	5	0.5	1	1	120	92	95	100×30	80×30
	250/5	5	0.5	1	1	120	92	95	100×30	80×30
	300/5	5	0.5	1	1	120	92	95	100×30	80×30
	400/5	5	0.5	1	1	120	92	95	100×30	80×30
	500/5	5	0.5	1	1	120	92	95	100×30	80×30
	600/5	5	0.5	1	1	120	92	95	100×30	80×30
	750/5	5	0.5	1	1	120	92	95	100×30	80×30
	800/5	5	0.5	1	1	120	92	95	100×30	80×30
	1000/5	5	0.5	1	1	120	92	95	100×30	80×30
	1200/5	5	0.5	1	1	120	92	95	100×30	80×30
	1500/5	5	0.5	1	1	120	92	95	100×30	80×30
	2000/5	5	0.5	1	1	120	92	95	100×30	80×30
LMK1-0.66/120 (BH-0.66/120)	300/5	5	0.5	1	1	130	112	100	120×30	80×30
	400/5	5	0.5	1	1	130	112	100	120×30	80×30
	500/5	5	0.5	1	1	130	112	100	120×30	80×30
	600/5	5	0.5	1	1	130	112	100	120×30	80×30
	750/5	5	0.5	1	1	130	112	100	120×30	80×30
	800/5	5	0.5	1	1	130	112	100	120×30	80×30
	1000/5	5	0.5	1	1	130	112	100	120×30	80×30
	1200/5	5	0.5	1	1	130	112	100	120×30	80×30
	1500/5	5	0.5	1	1	130	112	100	120×30	80×30
	2000/5	5	0.5	1	1	130	112	100	120×30	80×30
LMK2-0.66/30 (SDH-0.66/30)	150/5	2.5	0.5	1	1	87	40	95	30×30	82×30
	200/5	5	0.5	1	1	87	40	95	30×30	82×30
	250/5	5	0.5	1	1	87	40	95	30×30	82×30
	300/5	5	0.5	1	1	87	40	95	30×30	82×30
	400/5	5	0.5	1	1	87	40	95	30×30	82×30
	500/5	5	0.5	1	1	87	40	95	30×30	82×30
	600/5	5	0.5	1	1	87	40	95	30×30	82×30
	750/5	5	0.5	1	1	87	40	95	30×30	82×30
	800/5	5	0.5	1	1	87	40	95	30×30	82×30
	1000/5	5	0.5	1	1	87	40	95	30×30	82×30
LMK2-0.66/40 (SDH-0.66/40)	200/5	5	0.5	1	1	90	45	118	40×30	81×30
	250/5	5	0.5	1	1	90	45	118	40×30	81×30
	300/5	5	0.5	1	1	90	45	118	40×30	81×30
	400/5	5	0.5	1	1	90	45	118	40×30	81×30
	500/5	5	0.5	1	1	90	45	118	40×30	81×30
	600/5	5	0.5	1	1	90	45	118	40×30	81×30
	750/5	5	0.5	1	1	90	45	118	40×30	81×30
	800/5	5	0.5	1	1	90	45	118	40×30	81×30
	1000/5	5	0.5	1	1	90	45	118	40×30	81×30
LMK2-0.66/60 (SDH-0.66/60)	300/5	5	0.5	1	1	102	60	145	60×30	81×30
	400/5	5	0.5	1	1	102	60	145	60×30	81×30
	500/5	5	0.5	1	1	102	60	145	60×30	81×30
	600/5	5	0.5	1	1	102	60	145	60×30	81×30
	750/5	5	0.5	1	1	102	60	145	60×30	81×30
	800/5	5	0.5	1	1	102	60	145	60×30	81×30
	1000/5	5	0.5	1	1	102	60	145	60×30	81×30
	1200/5	5	0.5	1	1	102	60	145	60×30	81×30
	1500/5	5	0.5	1	1	102	60	145	60×30	81×30
LMK2-0.66/80 (SDH-0.66/80)	400/5	5	0.5	1	1	108	80	118	80×30	81×30
	500/5	5	0.5	1	1	108	80	118	80×30	81×30
	600/5	5	0.5	1	1	108	80	118	80×30	81×30
	750/5	5	0.5	1	1	108	80	118	80×30	81×30
	800/5	5	0.5	1	1	108	80	118	80×30	81×30
	1000/5	5	0.5	1	1	108	80	118	80×30	81×30
	1200/5	5	0.5	1	1	108	80	118	80×30	81×30
	1500/5	5	0.5	1	1	108	80	118	80×30	81×30
	2000/5	5	0.5	1	1	108	80	118	80×30	81×30
LMK3-0.66/100 (LN-0.66/100)	500/5	5	0.5	1	1	118	40	122	100×30	82×30
	600/5	5	0.5	1	1	118	40	122	100×30	82×30
	750/5	5	0.5	1	1	118	40	122	100×30	82×30
	800/5	5	0.5	1	1	118	40	122	100×30	82×30
	1000/5	5	0.5	1	1	118	40	122	100×30	82×30
	1200/5	5	0.5	1	1	118	40	122	100×30	82×30
	1500/5	5	0.5	1	1	118	40	122	100×30	82×30
	2000/5	5	0.5	1	1	118	40	122	100×30	82×30
LMK3-0.66/120 (LN-0.66/120)	600/5	5	0.5	1	1	140	52	122	120×30	82×30
	750/5	5	0.5	1	1	140	52	122	120×30	82×30
	800/5	5	0.5	1	1	140	52	122	120×30	82×30
	1000/5	5	0.5	1	1	140	52	122	120×30	82×30
	1200/5	5	0.5	1	1	140	52	122	120×30	82×30
	1500/5	5	0.5	1	1	140	52	122	120×30	82×30
	2000/5	5	0.5	1	1	140	52	122	120×30	82×30
	2500/5	5	0.5	1	1	140	52	122	120×30	82×30
LMK3-0.66/150 (LN-0.66/150)	800/5	5	0.5	1	1	187	80	132	150×30	127×30
	1000/5	5	0.5	1	1	187	80	132	150×30	127×30
	1200/5	5	0.5	1	1	187	80	132	150×30	127×30
	1500/5	5	0.5	1	1	187	80	132	150×30	127×30
	2000/5	5	0.5	1	1	187	80	132	150×30	127×30
	2500/5	5	0.5	1	1	187	80	132	150×30	127×30
	3000/5	5	0.5	1	1	187	80	132	150×30	127×30
LMK3-0.66/200 (LN-0.66/200)	1000/5	5	0.5	1	1	176	80	176	200×30	127×30
	1200/5	5	0.5	1	1	176	80	176	200×30	127×30
	1500/5	5	0.5	1	1	176	80	176	200×30	127×30
	2000/5	5	0.5	1	1	176	80	176	200×30	127×30
	2500/5	5	0.5	1	1	176	80	176	200×30	127×30
	3000/5	5	0.5	1	1	176	80	176	200×30	127×30
LMK3-0.66/250 (LN-0.66/250)	1500/5	5	0.5	1	1	227	80	180	250×30	127×30
	2000/5	5	0.5	1	1	227	80	180	250×30	127×30
	2500/5	5	0.5	1	1	227	80	180	250×30	127×30
	3000/5	5	0.5	1	1	227	80	180	250×30	127×30
	4000/5	5	0.5	1	1	227	80	180	250×30	127×30
LMK3-0.66/300 (LN-0.66/300)	1500/5	5	0.5	1	1	248	88	178	300×40	228×40
	2000/5	5	0.5	1	1	248	88	178	300×40	228×40
	2500/5	5	0.5	1	1	248	88	178	300×40	228×40
	3000/5	5	0.5	1	1	248	88	178	300×40	228×40
	4000/5	5	0.5	1	1	248	88	178	300×40	228×40
LMK3-0.66/400 (LN-0.66/400)	2000/5	5	0.5	1	1	270	88	198	400×40	228×40
	2500/5	5	0.5	1	1	270	88	198	400×40	228×40
	3000/5	5	0.5	1	1	270	88	198	400×40	228×40
	4000/5	5	0.5	1	1	270	88	198	400×40	228×40
	5000/5	5	0.5	1	1	270	88	198	400×40	228×40

Engineering Drawing

Specification & Outline Drawing

Original image, not compressed

Dimension & outline drawing of SDH-0.66 — click image to zoom / view original.