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ASTO-21C

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The ABB ASTO-21C is a dedicated protection board engineered to monitor and safeguard ABB drive systems, ensuring stable operation via precise signal detection and voltage compatibility.
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Technical specifications for ASTO-21C

  • Manufacturer:
    ABB
  • Part Number:
    ASTO-21C
  • Product Family:
    ABB Drives
  • Product Type:
    3AUA0000065265
  • Supply voltage range:
    +24 V DC +/- 10%
  • Current consumption:
    40 mA (20 mA/channel)
  • Supply cable:
    A single-shielded twisted pair
  • Maximum cable length:
    300 m
  • Conductor min. cross section:
    0.5 mm2, 20 AWG
  • Logic levels:
    0 < 5 V DC, 1 > 17 V DC
  • Ambient temperature:
    0…50 °C
  • Relative humidity:
    Max. 90%, no condensation allowed
  • Altitude in operation:
    0…2000 m
  • Weight:
    0.09 kg
  • Estimated shipping dimensions:
    14.5 x11x2cm
  • Tariff Code:
    8537101190
  • Country of origin:
    Sweden
  • Place of shipment:
    Xiamen, Fujian, China
By purchasing this item, you agree to the Terms & Conditions, ApterPower is not an authorized distributor for listed manufacturers or tradenames and therefore the manufacturer's warranty does not apply. All our products come with ApterPower's 1-year warranty.
Description
The ABB ASTO-21C Protection Board is a fully original, high-performance safety module designed for ABB ACS800 drives and other industrial automation systems. It provides Safe Torque Off (STO) functionality to prevent accidental startup and enhance operator safety in industrial environments.

The board operates with a supply voltage range of +24 V DC ±10%, consuming approximately 40 mA (20 mA per channel). It connects via a single-shielded twisted pair cable, supporting a maximum length of 300 m with a minimum conductor cross-section of 0.5 mm² (20 AWG). Logic levels are clearly defined as “0” < 5 V DC and “1” > 17 V DC, ensuring precise and reliable signaling.

Engineered for industrial environments, the ASTO-21C can function in temperatures from 0 to 50 °C, with relative humidity up to 90% (no condensation allowed), and at altitudes up to 2000 m. Its robust design ensures consistent performance and integration with ABB drive systems, maintaining safe operation under varying environmental conditions.

This protection board is ideal for integrating into ACS800 drive systems to enhance safety compliance, prevent unintended motor operation, and provide long-term reliable protection in industrial automation applications.
Alternative Names
AST0-21C ASTO-2IC ASTO-Z1C ASTO21C AST021C ASTO2IC ASTOZ1C
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FAQS

The following is a list of questions commonly asked by our customers. Please contact us if you have a question about our process that is not answered below.
What supply voltage does it require?
It operates at +24 V DC ±10%.
How much current does it consume?
Approximately 40 mA, with 20 mA per channel.
What type of cable should be used?
A single-shielded twisted pair cable, up to 300 m long.
Is the ABB ASTO-21C Protection Board new?
Yes, it is fully original and brand new.
What are the logic level thresholds?
“0” is below 5 V DC, and “1” is above 17 V DC.
What temperature range can it operate in?
From 0 °C to 50 °C.
How long is the warranty?
It comes with a free 1-year warranty from Apter Power.
Does it support high humidity environments?
Yes, up to 90% relative humidity, but condensation is not allowed.