Technical specifications - PENN Controls - LIT-12012249 - A421ABT - A421AET - Electronic Temperature Control - A421 Duty‐Cycle/Ventilation Models

A421 Series Electronic Temperature Controls with Cycle Timer Product Bulletin

PENN Controls
Product name
A421 Duty‐Cycle/Ventilation Models
Document type
Product Bulletin
Document number
Revision date
Table 1. A421 temperature control output relay contacts electrical ratings
Agency and file UL 60730 and EN 60730
Applied AC Voltage at 50/60 Hz 120 VAC 208 VAC 240 VAC
Horsepower LC/LNO (LC/LNC) 1 (0.25) 1 (0.3) 1 (0.5)
Full load amperes LC/LNO (LC/LNC) 16 (5.8) 9.2 (4) 8 (4.9)
Locked rotor amperes LC/LNO (LC/LNC) 96 (34.8) 55.2 (24) 48 (29.4)
Resistive amperes LC/LNO (LC/LNC) 15 (10) 10 (10) 10 (10)
Pilot duty VA LC/LNO (LC/LNC) 125 (125) 125 (125) 125 (125)
Table 2. A421 Series Electronic Temperature Controls technical specifications
Specification Description
Power consumption 1.8 VA maximum
Supply power 110/120 or 208/230/240 VAC, 50/60 Hz
Ambient conditions

Type 1/IP20:

Operating: -40°F to 150°F (-40°C to 66°C), 0% to 95% RH noncondensing

Shipping and storage: -40°F to 185°F (-40°C to 85°C), 0% to 95% RH noncondensing

Type 4X/IP66:

Operating: -40°F to 140°F (-40°C to 60°C)

Shipping and storage: -40°F to 140°F (-40°C to 60°C)

Temperature control Range -40°F to 212°F (-40°C to 100°C)
Sensor type A99 PTC temperature sensor: 1,035 ohm at 77°F (25°C)
Sensor offset range ±5ºF or ±3ºC
Enclosure material

Type 1, IP20 high-impact thermoplastic or

Type 4X, IP66 watertight, corrosion-resistant, high-impact thermoplastic

Note: You must torque the cover screws on the enclosures to 10 to 12 in·lb (1.1 N·m to 1.4 N·m) to achieve Type 1 or Type 4X rating.
Compliance North America: cULus Listed; UL 60730, File E27734; FCC Compliant to CFR47, Part 15, Subpart B, Class B Industry Canada (IC) Compliant to Canadian ICES-003, Class B limits

Europe: CE Mark – Johnson Controls declares that this product is in compliance with the essential requirements and other relevant provisions of the EMC Directive; Low Voltage Directive.
  Australia/NZ: RCM Emissions Compliant

The performance specifications are nominal and conform to acceptable industry standards. For application at conditions beyond these specifications Johnson Controls shall not be liable for damages resulting from misapplication or misuse of its products.