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HIGH PRECISION MEASUREMENT CLASS 0.5 FOR 20-60 kW INSTALLATIONS
Socomec TCA21 class 0.5 current transformers are your allies for high-precision monitoring of your professional photovoltaic installations. Manufactured in Alsace, France, and available in two ratings (200A/5A and 250A/5A), they convert your high primary currents into a standard 5A signal with an error ≤ 0.5%, ideal for commercial metering and demanding energy management.
Manufactured in France by Socomec
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Socomec TCA21 Current Transformers - 200A/5A or 250A/5A - Class 0,5 - 2,5VA - Ø21mm
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Socomec TCA21 current transformers are professional measuring transducers designed to convert high primary currents (200A or 250A) into a standardised secondary current of 5A, suitable for DIRIS dataloggers, COUNTIS energy meters and monitoring systems. Available in two ratings (200A/5A and 250A/5A), they offer an accuracy class of 0.5 and an apparent power rating of 2.5VA, guaranteeing highly accurate measurement for your photovoltaic, tertiary and industrial installations.
A product with multiple variations This product data sheet covers two models in the TCA21 range: TCA21 200A/5A (ref. 192T2020): 20-45 kW installations TCA21 250A/5A (ref. 192T2024): 25-60 kW installations Both models share the same characteristics (class 0.5, 2.5VA, Ø21mm, DIN rail) and differ only in their primary rating.
A product with multiple variations
This product data sheet covers two models in the TCA21 range:
Both models share the same characteristics (class 0.5, 2.5VA, Ø21mm, DIN rail) and differ only in their primary rating.
Current transformers are essential for measuring high currents safely and accurately:
Accuracy class 0.5 means that the measurement error is less than or equal to 0.5% in the current range 5%-120% In :
Comparative table of accuracy classes Classe Erreur max Application typique Surcoût 0,2S ≤ 0,2% Comptage fiscal haute précision +80-120% 0,5 ≤ 0,5% Comptage commercial, monitoring PV précis ✅ Référence 1 ≤ 1% Comptage industriel standard, monitoring PV -30% 3 ≤ 3% Protection, indication approximative -50% TCA21 class 0.5: excellent accuracy/price ratio for professional photovoltaic installations.
Comparative table of accuracy classes
TCA21 class 0.5: excellent accuracy/price ratio for professional photovoltaic installations.
The nominal apparent secondary power (Sn = 2.5VA) defines the maximum load supported by the CT:
Comparison TCA21 (2.5VA) vs TCA22 (3.75VA) Modèle Sn Z max Longueur câble max (2,5mm²) Usage recommandé TCA21 (Ø21mm) 2,5 VA 0,10 Ω 30-40m Installation compacte, TC proche tableau ✅ TCA22 (Ø22,5mm) 3,75 VA 0,15 Ω 50-60m Installation étendue, TC éloigné tableau Choice: If distance between CT and power station < 20m → TCA21 (more compact, less expensive). If > 30m → TCA22.
Comparison TCA21 (2.5VA) vs TCA22 (3.75VA)
Choice: If distance between CT and power station < 20m → TCA21 (more compact, less expensive). If > 30m → TCA22.
FS 5 guarantees that the CT withstands currents of up to 5 x In for 1 second without degradation:
The21mm bore allows the passage of :
⚠️ Difference TCA21 (Ø21mm) vs TCA22 (Ø22.5mm) TCA21 Ø21mm: cables ≤ 70 mm², bars ≤ 15x5mm → standard residential/tertiary installations ✅ TCA22 Ø22.5mm: cables ≤ 95 mm², bars ≤ 20x5mm → high power installations (> 30 kW single, > 60 kW three)
⚠️ Difference TCA21 (Ø21mm) vs TCA22 (Ø22.5mm)
TCA21s offer two mounting modes:
Socomec, founded in 1922 and based in Benfeld (Alsace, France), is a European leader in low-voltage electrical equipment:
💡Sizing rule: choose CT with In ≥ 1.2 x rated installation current for safety margin and compliance with permanent overload 1.2 In. Example: Three-phase inverter 50 kW → Current per phase = 50,000 / (√3 × 400) = 72A → Choose TCA21 200A/5A (200A ≥ 1.2 × 72A = 86.4A ✅)
💡Sizing rule: choose CT with In ≥ 1.2 x rated installation current for safety margin and compliance with permanent overload 1.2 In.
Example: Three-phase inverter 50 kW → Current per phase = 50,000 / (√3 × 400) = 72A → Choose TCA21 200A/5A (200A ≥ 1.2 × 72A = 86.4A ✅)
⚠️ Critical rule: never leave the secondary open If the secondary is disconnected on load (open circuit), the CT behaves like a step-up transformer: Secondary overvoltage of up to several kV (danger of electrocution) Destructive heating of the magnetic core (saturation) Destruction of the transformer ✅ Solution: double short-circuit terminals TCA21s have terminals enabling the secondary to be short-circuited before disconnection, eliminating any risk.
⚠️ Critical rule: never leave the secondary open
If the secondary is disconnected on load (open circuit), the CT behaves like a step-up transformer:
✅ Solution: double short-circuit terminals
TCA21s have terminals enabling the secondary to be short-circuited before disconnection, eliminating any risk.
Socomec TCA21 transformers integrate perfectly with Wattuneed monitoring and energy management solutions:
Turn your photovoltaic installation into an intelligent production plant with the high-precision monitoring of Socomec TCA21 current transformers.
Wattuneed, your partner for measured and optimised photovoltaic installations.
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